feat(unstable): ability to npm install then deno run main.ts (#20967)

This PR adds a new unstable "bring your own node_modules" (BYONM)
functionality currently behind a `--unstable-byonm` flag (`"unstable":
["byonm"]` in a deno.json).

This enables users to run a separate install command (ex. `npm install`,
`pnpm install`) then run `deno run main.ts` and Deno will respect the
layout of the node_modules directory as setup by the separate install
command. It also works with npm/yarn/pnpm workspaces.

For this PR, the behaviour is opted into by specifying
`--unstable-byonm`/`"unstable": ["byonm"]`, but in the future we may
make this the default behaviour as outlined in
https://github.com/denoland/deno/issues/18967#issuecomment-1761248941

This is an extremely rough initial implementation. Errors are
terrible in this and the LSP requires frequent restarts. Improvements
will be done in follow up PRs.

cli/graph_util.rs

@@ -435,9 +435,9 @@ impl ModuleGraphBuilder {
       self.file_fetcher.clone(),
       self.options.resolve_file_header_overrides(),
       self.global_http_cache.clone(),
+      self.npm_resolver.clone(),
       self.parsed_source_cache.clone(),
       permissions,
-      self.options.node_modules_dir_specifier(),
     )
   }