esbuild resolver for Vite dependency optimization

[lolmaus]

Taking over @ef4's branch esbuild-resolver. Rebased it against main.

[lolmaus]

Here's a demo app that uses it and it has an issue (see comments over the link):
mansona/ember-vite-app#1

[lolmaus]

@mansona and me have found the reason why the build of ember-vite-app build was failing after using @ef4's EsbuildResolver.

Instead of having EsbuildResolver resolve external dependencies, we have have it mark as external: true and do nothing, which lets Vite take over and do the right thing via Embroider.

Notes:

1. This may not be the most performance-efficient thing to do, but it seems to be at least correct, so we should consider merging this and iterate/improve on the implementation.
2. There may be more dead code in @ef4's commit after we added the early return.

[NullVoxPopuli]

✂️ ?

[NullVoxPopuli]

I would feel better about this if we have some tests that used rollup build, but I understand there is a bit of a catch-22 here, and progress does need to be made.

[mansona]

This went a different direction: #1650