Compile errors for tools extensions due to vscodeTypes.d.ts

[joyceerhl]

This library mirrors several VS Code types in https://github.com/microsoft/vscode-prompt-tsx/blob/3d2874137df8515e49476c55fb3f4f7bc8ba5469/src/base/vscodeTypes.d.ts, we should avoid this if possible and find a better solution because it is currently causing compile errors for tools extensions.

Filing on request from @jrieken

[connor4312]

I think we'd remove the types there and have @types/vscode as an optionalDependency. Then instruct users to install it alongside prompt tsx, and possibly do it automatically for them if @vscode/dts is not already installed (like how esbuild automatically installs the optional dependency with the binary for the current platform)