Extend GitProxy to Handle All GitHub Communications and Reviews

**Is your feature request related to a problem? Please describe.**
Financial institutions and enterprises with strict security requirements need complete control and visibility over all GitHub interactions, including both git protocol operations and web-based communications. While git-proxy handles some git protocol operations, a comprehensive solution is needed that covers all possible interaction channels with GitHub. This includes git protocol operations (push/pull/fetch), API communications, issue management, pull request reviews, and general GitHub interactions. Currently, the fragmented coverage of these channels creates potential security gaps, makes it difficult to maintain a complete audit trail, and risks sensitive information being accidentally exposed.

**Describe the solution you'd like**
Implement a comprehensive GitHub proxy layer that intercepts and manages all forms of GitHub interaction from within an organization:

1. Git Protocol and Web/API Communication Coverage:
- SSH protocol communications
- HTTPS protocol communications
- REST API calls to GitHub
- GraphQL API communications

2. Feature Coverage:
- Issues Management:
- Creation and modification of issues
- Comment management
- Pull Request Operations:
- PR creation and updates
- Review comments and discussions
- Review state management (approve/reject/request changes)

3. Security Features:
- Content scanning pipeline for all communications (both git and web)
- Pattern matching for sensitive data (API keys, internal IPs, etc.)
- Custom regex rules for organization-specific sensitive data
- Automatic redaction of identified sensitive information
- Block/Allow lists for specific types of content
- Pre-push hooks for git operations
- Commit content scanning

5. Audit Capabilities:
- Detailed logging of all GitHub interactions (git and web)
- Who-did-what-when tracking across all channels
- Full text search across historical communications
- Git operation audit trail
- Export capabilities for compliance reporting
- Commit history analysis

6. Review Workflow:
- Multi-level approval process for different types of operations
- Automated review rules based on content patterns
- Emergency override capabilities with proper authentication
- Pre-push review requirements

7. Administration:
- Role-based access control for all proxy features
- Configuration management through code
- Health monitoring and alerts
- Performance metrics and analytics

**Additional context**
This feature would be particularly valuable for:
- Financial institutions requiring strict compliance with regulations
- Organizations handling sensitive intellectual property
- Enterprises with strict data loss prevention requirements

The implementation should provide a unified interface for managing all GitHub interactions while being minimally intrusive to developer workflows.