API Reference support for .NET

[gracegoo-stripe]

Master task for building out a language server to support this use case:

Checklist

• [x] Set up dotnet server and connect it to the extension
• [x] Implement API reference handler with semantic model analysis.
• [x] Implement Text document hander
• [x] Client-side: Add conditional server startup logic based on workspace project
• [x] Client-side: Update dotnet executable fetching -- right now it's hard-coded
• [x] Get the project file from the client
• [x] Update the configuration file with real entries
• [x] Update debugging steps since we've merged the repos
• [x] Bundling
• [ ] Channel logs to the output channel of the extension -- right now only errors are getting through.