Migrate to esbuild

[Tyriar]

This is a work in progress, here are the goals of the change:

• Reduce build/watch time
• Reduce bundle size
• Simplify build by removing webpack and having dev builds run the same way
• Simplify sourcemaps
• Self host with the demo in a way that's closer to real world usage by importing the modules

Currently building everything from scratch takes less than a second(!), compared to ~16 seconds for tsc on my machine:

Current issues:

• There are some complications particularly around inwasm, the image addon build doesn't work yet.
• Not sure how to handle tests yet, for now we can continue to build them to out/ and out-test/ and run them the old way as we need to do a full tsc build anyway to check types.
• VS Code task order could be improved
• The demo-client build can fail when run currently as it actually depends on xterm*

[Tyriar]

Looks like this sort of thing will work for tests:

.\node_modules\.bin\esbuild src/**/*.ts --outdir=out-esbuild --format=cjs

[jerch]

There are some complications particularly around inwasm, the image addon build doesn't work yet.

Does this use ESM output for addon sources? Because thats not fully supported yet with inwasm.

[Tyriar]

It does yeah as that's something else people want (and VS Code supports now). I think we could special case the image addon in the meantime

[Tyriar]

Putting this on hold as it was a weekend project that didn't make it in time 🙂