feat: Added RepoAnalyzer to empower auto-summary of a workspace

[xisen-w]

This commit introduces a new RepoAnalyser class in the repo_utils module,
designed to provide comprehensive analysis of Python repositories.

Key features:

• Generate a tree-like structure of the repository
• Summarize repository contents, including files, classes, and functions
• Analyze function signatures and docstrings without executing code
• Adjust verbosity levels for summaries
• Extract content from specific files

The RepoAnalyzer offers:

• Safe analysis of potentially unknown or untrusted code
• Flexible output detail levels to suit different use cases
• Efficient traversal and summarization of repository structure

This feature enhances our ability to quickly understand and document
Python codebases, improving code review processes and documentation efforts.

Tested:

• Manually tested with various Python repositories
• Verified correct handling of different file structures and function types
• Confirmed safe operation when analyzing files with complex or undefined references

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📚 Documentation preview 📚: https://RDAgent--264.org.readthedocs.build/en/264/