Added run_in_ns_wrapper to only run in namespace when root is detected.

[pcarella1]

This PR adds support for running gprofiler without root/sudo as discussed in issue 905 in the gprofiler repo: intel/gprofiler#905.

It creates run_in_ns_wrapper function which bypasses the code to enter name spaces when not root (as we assume we're always in the correct namespace for the processes being profiled).

This commit is required for PR 936 in the gprofiler repo intel/gprofiler#936.

I have tested this on x86 using scripts/build_x86_64_executable.sh script. Centos 9 Stream w/ kernel 6.6, though with some limitations mentioned in the gprofiler PR.

The code is linted.

One issue is when running on one system, I receive the below warning (though gprofiler completes and produces valid results)

[2024-12-02 19:59:55,557] WARNING: gprofiler.profilers.java: Failed to enable proc_events listener for exited Java processes (this does not prevent Java profiling)
Traceback (most recent call last):
File "granulate_utils/linux/proc_events.py", line 222, in start
PermissionError: [Errno 1] Operation not permitted

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "gprofiler/profilers/java.py", line 1395, in start
proc_events.register_exit_callback(self._proc_exit_callback)
File "granulate_utils/linux/proc_events.py", line 272, in wrapper
File "granulate_utils/linux/ns.py", line 305, in run_in_ns_wrapper
File "granulate_utils/linux/ns.py", line 299, in run_in_ns_wrapper
File "granulate_utils/linux/proc_events.py", line 260, in _start_listener
File "granulate_utils/linux/proc_events.py", line 225, in start
PermissionError: This process doesn't have permissions to bind/connect to the process events connector

Issue seems to be that this bind call in the threading library requires root. Is this because the read we're trying to bind to is owned by root or does the function just inherently require root? I haven't been able to diagnose this.
https://github.com/Granulate/granulate-utils/blob/0cb9b70f4eda85f0a14e86ec41ecc7b57a133755/granulate_utils/linux/proc_events.py#L222

[pcarella1]

I added a new commit that addresses your comments. Biggest change is moving is_root into granulate-utils. Is ns.py the right place to add it? That's where it gets used.

[sobolron]

I added a new commit that addresses your comments. Biggest change is moving is_root into granulate-utils. Is ns.py the right place to add it? That's where it gets used.

Wouldn't create another file just for this and I don't think any other file fits better. Leave it like this.

Replacing him in this PR.

[sobolron]

@pcarella1 When it's ready please also move to ready to review so CI will run and we'll see tests.