build: switch pydance from tsc to esbuild for faster bundling

[ram-nadella]

Summary

• Replace TypeScript compiler with esbuild for production builds
• Add bundling to address GitHub Actions warning about extension performance
• Significantly reduce VSIX package size by excluding node_modules

Changes

1. Added esbuild as dev dependency for fast bundling
2. Created esbuild.js configuration that:
   • Bundles all dependencies into a single file
   • Minifies code for production builds (346KB vs 783KB)
   • Excludes VS Code API (marked as external)
   • Generates source maps only for development
3. Updated package.json scripts to use esbuild:
   • compile: Development build
   • watch: Watch mode for development
   • package: Production build with minification
   • vscode:prepublish: Now runs the production build
4. Updated .vscodeignore to exclude entire node_modules directory since code is bundled

Test plan

• Verify npm run compile builds successfully
• Verify npm run package creates minified production bundle
• Check bundle size reduction (346KB minified vs 783KB unminified)
• Test extension functionality with bundled code
• Verify GitHub Actions build passes without bundling warning

This addresses the warning: "This extension consists of 205 files, out of which 172 are JavaScript files. For performance reasons, you should bundle your extension"

🤖 Generated with Claude Code