Two unrelated commits:

QoL in VS Code

• Recommended extensions for LSP to work properly in Deno, Rust and Typescript (last outstanding nit is to have deno fmt run on save in the deno subdir rather than prettier)
• Default to non-relative imports in the ts subdir. Promotes consistency and since we have the aliases set up anyway, makes it easier to refactor/move files around.
• Integrated VS Code terminal opens with the local tooling in $PATH (don't need to remember run . deno/local-setup.sh)

Rust server nit:

• Bubble up fatal errors in the server and print them (previously silently failing on errors e.g. if port was already taken)