Implement VSCode Extension for Codegen

[codegen-sh]

This PR implements a VSCode extension for Codegen, providing an integrated experience for using Codegen's AI capabilities directly within VSCode.

Features

• Chat Interface: A sidebar chat interface for interacting with Codegen
• Code Generation: Generate code based on natural language descriptions
• Code Explanation: Get explanations for selected code
• Code Improvement: Get suggestions to improve your code
• Code Fixing: Get help fixing bugs in your code
• Context Menu Integration: Right-click on selected code to access Codegen features
• Status Bar Integration: Quick access to Codegen from the status bar

Implementation Details

• Uses the VSCode Extension API for deep integration with the editor
• Implements a WebView-based chat interface
• Provides a clean, VS Code-native UI experience
• Connects to the Codegen API for AI-powered assistance
• Supports configuration of API key and endpoint

Next Steps

• Add unit tests
• Implement more advanced code analysis features
• Add support for more languages and frameworks
• Improve the markdown rendering in the chat view
• Add telemetry for usage tracking (with opt-out option)
• Publish to the VSCode Marketplace

Screenshots

(Screenshots will be added once the extension is fully implemented and tested)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

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