Dynamically loading language server implementation from the local version of wireit

[rictic]

Ideally we'd use the local implementation of wireit to power not only the CLI but also the language server that powers many of the vscode extension's features.

There's a couple of ways we could slice this. We could dynamically import just ide.ts, or we could package up a complete language server binary as a bundle and include that in the wireit npm package.