Extend usage of Podman to analyze OCI image layers

[NotTheEvilOne]

What this PR does / why we need it:
This PR extends usage of Podman to analyze OCI image layers.

Which issue(s) this PR fixes:
Related #200

Special notes for your reviewer:
Depends on #211

[codecov]

Codecov Report

❌ Patch coverage is 85.33333% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.28%. Comparing base (e8d2c86) to head (4e08060).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/gardenlinux/oci/image.py	85.00%	9 Missing ⚠️
src/gardenlinux/oci/podman_object_context.py	65.38%	9 Missing ⚠️
...gardenlinux/features/reproducibility/comparator.py	89.47%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #320      +/-   ##
==========================================
- Coverage   91.60%   91.28%   -0.33%     
==========================================
  Files          47       49       +2     
  Lines        2894     2971      +77     
==========================================
+ Hits         2651     2712      +61     
- Misses        243      259      +16     

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