refactor(libscap): use scap_errprintf for scap errors handling

[ekoops]

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind bug

/kind cleanup

/kind design

/kind documentation

/kind failing-test

/kind feature

Any specific area of the project related to this PR?

Uncomment one (or more) /area <> lines:

/area API-version

/area build

/area CI

/area driver-kmod

/area driver-bpf

/area driver-modern-bpf

/area libscap-engine-bpf

/area libscap-engine-gvisor

/area libscap-engine-kmod

/area libscap-engine-modern-bpf

/area libscap-engine-nodriver

/area libscap-engine-noop

/area libscap-engine-source-plugin

/area libscap-engine-savefile

/area libscap

/area libpman

/area libsinsp

/area tests

/area proposals

Does this PR require a change in the driver versions?

/version driver-API-version-major

/version driver-API-version-minor

/version driver-API-version-patch

/version driver-SCHEMA-version-major

/version driver-SCHEMA-version-minor

/version driver-SCHEMA-version-patch

What this PR does / why we need it:

This PR replaces all custom scap errors handing with the usage of scap_errprintf macro.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[poiana]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[github-actions]

Please double check driver/API_VERSION file. See versioning.

/hold

[FedeDP]

/milestone 0.21.0

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.32%. Comparing base (0d94d2b) to head (174aafa).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2286   +/-   ##
=======================================
  Coverage   75.32%   75.32%           
=======================================
  Files         280      280           
  Lines       34556    34556           
  Branches     5902     5902           
=======================================
  Hits        26031    26031           
  Misses       8525     8525           

Flag	Coverage Δ
libsinsp	75.32% <ø> (ø)

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[github-actions]

Perf diff from master - unit tests

     3.83%     -0.83%  [.] next_event_from_file
     1.40%     +0.55%  [.] sinsp_parser::process_event
     9.59%     -0.49%  [.] sinsp_thread_manager::create_thread_dependencies
    18.25%     +0.46%  [.] sinsp_threadinfo::get_main_thread
     1.82%     +0.44%  [.] sinsp_thread_manager::get_thread_ref
     0.58%     -0.26%  [.] scap_next
     0.85%     -0.24%  [.] sinsp_evt::get_syscall_return_value
     0.64%     +0.23%  [.] sinsp_evt::get_ts
     0.74%     +0.21%  [.] sinsp_evt_filter::sinsp_evt_filter
     1.49%     -0.21%  [.] std::_Hashtable<long, std::pair<long const, std::shared_ptr<sinsp_threadinfo> >, std::allocator<std::pair<long const, std::shared_ptr<sinsp_threadinfo> > >, std::__detail::_Select1st, std::equal_to<long>, std::hash<long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >::_M_find_before_node

Heap diff from master - unit tests

peak heap memory consumption: -14.45K
peak RSS (including heaptrack overhead): 0B
total memory leaked: -14.45K

Heap diff from master - scap file

peak heap memory consumption: -14.45K
peak RSS (including heaptrack overhead): 0B
total memory leaked: -14.45K

Benchmarks diff from master

Comparing gbench_data.json to /root/actions-runner/_work/libs/libs/build/gbench_data.json
Benchmark                                                         Time             CPU      Time Old      Time New       CPU Old       CPU New
----------------------------------------------------------------------------------------------------------------------------------------------
BM_sinsp_split_mean                                            -0.0505         -0.0506           150           143           150           143
BM_sinsp_split_median                                          -0.0519         -0.0520           151           143           151           143
BM_sinsp_split_stddev                                          +0.5028         +0.5031             1             1             1             1
BM_sinsp_split_cv                                              +0.5827         +0.5832             0             0             0             0
BM_sinsp_concatenate_paths_relative_path_mean                  -0.0634         -0.0635            63            59            63            59
BM_sinsp_concatenate_paths_relative_path_median                -0.0696         -0.0696            63            59            63            58
BM_sinsp_concatenate_paths_relative_path_stddev                -0.4821         -0.4827             1             0             1             0
BM_sinsp_concatenate_paths_relative_path_cv                    -0.4471         -0.4476             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_mean                     +0.0371         +0.0370            24            25            24            25
BM_sinsp_concatenate_paths_empty_path_median                   +0.0364         +0.0362            24            25            24            25
BM_sinsp_concatenate_paths_empty_path_stddev                   +1.1408         +1.1539             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_cv                       +1.0642         +1.0770             0             0             0             0
BM_sinsp_concatenate_paths_absolute_path_mean                  -0.0366         -0.0367            62            60            62            60
BM_sinsp_concatenate_paths_absolute_path_median                -0.0250         -0.0250            62            61            62            61
BM_sinsp_concatenate_paths_absolute_path_stddev                +3.3203         +3.3154             0             1             0             1
BM_sinsp_concatenate_paths_absolute_path_cv                    +3.4846         +3.4796             0             0             0             0
BM_sinsp_split_container_image_mean                            -0.0095         -0.0095           395           391           395           391
BM_sinsp_split_container_image_median                          -0.0121         -0.0121           396           391           396           391
BM_sinsp_split_container_image_stddev                          -0.4587         -0.4591             4             2             4             2
BM_sinsp_split_container_image_cv                              -0.4535         -0.4539             0             0             0             0