feat(#122): CreatePull

[h1alexbel]

closes #122

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PR-Codex overview

This PR focuses on implementing new features and improvements related to GitHub integration.

Detailed summary

• Added CreateTree class to create GitHub tree.
• Added CreateCommit class to create GitHub commit.
• Added KebabCase class to convert text to kebab case.
• Added CommitBody class to generate GitHub commit request body.
• Implemented unit tests for KebabCase class.
• Added TODOs for future implementation.

The following files were skipped due to too many changes: src/test/java/git/tracehub/extensions/MockedTree.java, src/test/java/git/tracehub/agents/github/CreateTreeTest.java, src/main/java/git/tracehub/agents/github/TreeBody.java, src/main/java/git/tracehub/agents/github/issues/YmlIssue.java, src/test/java/git/tracehub/agents/github/TreeBodyTest.java, src/test/java/git/tracehub/agents/github/CommitBodyTest.java, src/test/java/git/tracehub/agents/github/CreatePullTest.java, src/main/java/git/tracehub/agents/github/CreatePull.java, src/test/java/it/CreatePullITCase.java, src/test/java/git/tracehub/agents/github/CreateCommitTest.java, src/test/resources/it/github/new-issue.json, src/test/resources/github/hooks/opened/new-issue.json

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[codecov[bot]]

Codecov Report

Attention: 26 lines in your changes are missing coverage. Please review.

Comparison is base (a519e53) 81.10% compared to head (dd8251a) 77.89%. Report is 22 commits behind head on master.

Files	Patch %	Lines
...in/java/git/tracehub/agents/github/CreatePull.java	0.00%	23 Missing :warning:
.../java/git/tracehub/agents/github/CreateCommit.java	0.00%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #123 +/- ## ============================================ - Coverage 81.10% 77.89% -3.21% - Complexity 120 131 +11 ============================================ Files 39 46 +7 Lines 397 457 +60 Branches 20 20 ============================================ + Hits 322 356 +34 - Misses 69 95 +26 Partials 6 6 ```

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[h1alexbel]

todos created, need to merge