Attributes parsing, validation puzzles, moving to XML validation

[h1alexbel]

closes #11

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PR-Codex overview

This PR focuses on redesigning the Project interface and adding new dependencies.

Detailed summary

• Redesigned Project interface, removing the Text interface and adding new methods for ID, performers, and dependencies.
• Added jackson-dataformat-yaml and Saxon-HE dependencies to the pom.xml file.
• Added validation XSL files for checking project roles and performers in the src/test/resources/github/validation directory.

The following files were skipped due to too many changes: src/main/java/git/tracehub/Performer.java, src/main/java/git/tracehub/agents/github/GhProject.java, src/test/java/git/tracehub/PerformerTest.java, src/test/java/git/tracehub/agents/github/GhProjectTest.java

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[h1alexbel]

@rultor try to merge

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (354c79b) 73.86% compared to head (049905e) 76.78%. Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #37 +/- ## ============================================ + Coverage 73.86% 76.78% +2.91% - Complexity 55 62 +7 ============================================ Files 20 21 +1 Lines 199 224 +25 Branches 12 14 +2 ============================================ + Hits 147 172 +25 Misses 47 47 Partials 5 5 ```

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[rultor]

@rultor try to merge

@h1alexbel OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor try to merge

@h1alexbel Done! FYI, the full log is here (took me 2min)