feat: add bundle=false support

[josephglanville]

Implements support for disabling bundling.

Fixes #97

[CLAassistant]

All committers have signed the CLA.

[gregmagolan]

Thanks for the PR. Is the use case here to use esbuild as a transpiler instead of a bundler?

[josephglanville]

Essentially yes. I didn't get around to finishing this because we unfortunately chose to go a different way.

My eventual goal was to also introduce the possibility of using plugins in the esbuild wrapper too so that you can combine esbuild with Babel for instance. (specifically for handling twin-macro)

I might pick this up again eventually but for now it's unlikely I end up finishing it.

[josephglanville]

I'm back to working on this. I will work on adding some tests for this feature and then mark the PR ready for review.

[gregmagolan]

Sorry this one took so long to get it. Fell off the radar.

I rebased and added a commit to cleanup the new e2e test & fixup the providers when bundle is off. Also refactored a bit so the differeces between --bundle and --nobundle are easier to see and maintain.

Should be good to land now