Language Server Protocol Support

[thecodingwizard]

Immediate tasks:

• [x] add monaco-languageclient
• [x] add clangd-12
• [ ] Java
• [ ] Python

Future:

• [ ] improve LSP server code (prevent it from dying due to lack of memory)
• [ ] implement code bundling in a way that lets monaco be cached
• [ ] Add compile flags to LSP
• [ ] Improve connection UI (probably a status indicator rather than toasts)
• [ ] Add ability to disable LSP
• [ ] Add timeout to LSP to auto-stop LSP
• [ ] e2e tests for LSP

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References: https://github.com/TypeFox/monaco-languageclient and https://github.com/radian-software/riju