Fix ArtifactHandler injection to be compatible with Maven 4

[cstamas]

The injected ArtifactHandler is empty one, moreover the "old" ArtifatHandler usage was mixed with Resolver ArtifactType. Dropped all that, using maven-core offered utility class instead, and redo properly the logic in case of custom class being converted to Resolver Artifact.

Locally all the build works and passes OK with latest Maven 4.

Fixes #522

[ascopes]

Thanks for taking the time to look into this, greatly appreciated!

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 86.98%. Comparing base (aeff23c) to head (a269e94).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ugin/dependencies/aether/AetherArtifactMapper.java	46.16%	6 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #524      +/-   ##
==========================================
- Coverage   87.88%   86.98%   -0.89%     
==========================================
  Files          40       40              
  Lines        1336     1321      -15     
  Branches       94       95       +1     
==========================================
- Hits         1174     1149      -25     
- Misses        122      132      +10     
  Partials       40       40              

Files with missing lines	Coverage Δ
...encies/aether/AetherMavenArtifactPathResolver.java	100.00% <100.00%> (ø)
...ugin/dependencies/aether/AetherArtifactMapper.java	79.49% <46.16%> (-16.80%)	⬇️

... and 1 file with indirect coverage changes

[cstamas]

@ascopes feel free to take over, modify and alter this PR in any way that suits you, my goals are achieved 😄

[ascopes]

Will do, thanks!