Fixes https://github.com/denoland/deno/issues/27062
In the LSP we were passing `npm` specifiers to TSC as roots, but TSC
needs fully resolved specifiers (like the actual file path).
In `deno check` we were often excluding the specifiers entirely from the
roots.
In both cases, we need to resolve the specifiers fully and then pass
them to tsc
The Deno Language Server provides a server implementation of the
Language Server Protocol
which is specifically tailored to provide a Deno view of code. It is
integrated into the command line and can be started via the lsp sub-command.
This documentation has been moved to the
Deno manual.