feat: Add option to update all packages without scanner input.

[ashnamehrotra]

Adds "--update-all" flag which will update all available packages to latest without having scanner input. First parses "/etc/os-release" file to determine os family, and then calls respective package managers to install updates.

Describe the changes in this pull request using active verbs such as Add, Remove, Replace ...

Closes #547
Closes #546

Part of #522

[codecov]

Codecov Report

Attention: Patch coverage is 14.19753% with 139 lines in your changes are missing coverage. Please review.

Project coverage is 35.13%. Comparing base (2602d59) to head (4f897df).
Report is 35 commits behind head on main.

Files	Patch %	Lines
pkg/patch/patch.go	30.98%	48 Missing and 1 partial ⚠️
pkg/pkgmgr/rpm.go	2.56%	38 Missing ⚠️
pkg/pkgmgr/apk.go	0.00%	29 Missing ⚠️
pkg/pkgmgr/dpkg.go	0.00%	22 Missing ⚠️
pkg/buildkit/buildkit.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #548      +/-   ##
==========================================
+ Coverage   32.51%   35.13%   +2.62%     
==========================================
  Files          17       18       +1     
  Lines        1621     1386     -235     
==========================================
- Hits          527      487      -40     
+ Misses       1062      867     -195     
  Partials       32       32              

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[sozercan]

@ashnamehrotra can we add integration tests for the --update-all flow

[sozercan]

Thank you! LGTM