Add esbuild transpiler

[dzbarsky]

[jbedard]

I think we need things such as:

• proper docs
• env vars
• remote exec flags
• at least one test, maybe one similar to the ones in https://github.com/aspect-build/rules_esbuild/tree/main/examples

[cgrindel]

There has not been much activity on this PR. For now, we will convert it to a draft. Please mark as ready for review when you are ready to proceed.

[alexeagle]

I think this was fixed in #98

[DavidZbarsky-at]

@alexeagle I think there's additional glue needed to plug esbuild into ts_project but it's doable 100% in "userspace" so it's fine to close this out, though its maybe worth having an example in the repo? I'm not sure how common it is to use esbuild as a transpiler

[alexeagle]

I see, would you like to push this one forward then?

[DavidZbarsky-at]

Yeah, I have the macro bit Jason mentioned done now, I'll polish it a bit and submit