Implement changes defined in ADR034 and 035

[NotTheEvilOne]

What this PR does / why we need it:
This PR implements changes required to suit ADR034 and 035.

Main changes

• Implementation of ADR 034 and 035. This requires renaming and introducing inherited classes for Flavor, VersionedFlavor and ArtifactBaseName in gardenlinux.features`.
• Fixing sorting of feature lists for flavors.yaml parser in gardenlinux.flavors.Parser
• Changes to various classes utilizing gardenlinux.features
• Implement changed naming to gl-features-parse and remove shortcut command line tool gl-cname.

Which issue(s) this PR fixes:
Fixes #376
Fixes #377
Requires #390

[codecov]

Codecov Report

❌ Patch coverage is 88.84540% with 57 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.13%. Comparing base (acc50b5) to head (d710296).
⚠️ Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
src/gardenlinux/features/artifact_base_name.py	85.61%	21 Missing ⚠️
src/gardenlinux/features/__main__.py	82.55%	15 Missing ⚠️
src/gardenlinux/s3/s3_artifacts.py	65.00%	7 Missing ⚠️
src/gardenlinux/features/c_name.py	93.02%	6 Missing ⚠️
src/gardenlinux/oci/container.py	66.66%	4 Missing ⚠️
src/gardenlinux/features/parser.py	88.88%	2 Missing ⚠️
src/gardenlinux/features/metadata_main.py	96.29%	1 Missing ⚠️
src/gardenlinux/oci/image_manifest.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #393      +/-   ##
==========================================
- Coverage   91.28%   91.13%   -0.15%     
==========================================
  Files          49       51       +2     
  Lines        2971     3002      +31     
==========================================
+ Hits         2712     2736      +24     
- Misses        259      266       +7     

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