rust: URI type implementation is non-compliant with LSP specification #442

Our current URI handling uses the rust-url crate, which implements the WHATWG URL spec. However, the Language Server Protocol (LSP) specification explicitly requires URI's to follow RFC 3986.

This causes parsing errors for valid file paths that contain special characters, such as [ or {, which are common in modern frontend frameworks (e.g., Next.js, SvelteKit).

Ref: https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#uri.