Remix integration

[axic]

We had a chat with @bunsenstraat (of Remix) about their LSP feature, which already works for Solidity. It uses a mix of AST JSON and a custom parser.

I was wondering if we could provide a simple non-HTTP LSP API of this library, compiled to wasm, to be used by Remix for Yul LSP. Once that works, we could provide Solidity LSP via the very same interface, and potentially as a separate project not integrated into the main solc codebase.