Build system upgrades

[RDIL]

As we all know, build systems are hard. Ours has gotten a bit convoluted with the introduction of challenges and mastery, and has some really slow and messy spots that can be improved upon. Here are some of the things I want to improve upon:

1. The dev server takes ~10 seconds to start the dev server on my M1 Mac - that's pretty slow. I've done some profiling, and the Brotli (de)compression of our contracts takes a super long time. We should switch this to messagepack instead.
2. We shouldn't do the work twice. We can use things like turborepo to cache and only do things once.
3. Rework the static folder and config handling - 8mb in 1 chunk is too much.
4. We should switch esbuild to output esm instead of commonjs, that way we can distribute multiple tiny chunks.