refactor(wasm): modify turborepo config

[TalDerei]

references #676

The responsibility of downloading proving keys is moved to the wasm package. I further simplified the turborepo configuration defined in turbo.json, while still adhering to the existing dependency chain, by utilizing the precompile script hook provided by npm. This hook is automatically executed before the compile / dev / build scripts, ensuring the proving keys are available before proceeding with the compilation of the WASM package. The top-level scripts in package.json will call this precompile step before continuing with their respective execution. As such, we remove the unnecessary explicit download-key call in favor of this precompile step.

Additionally, per #434 (comment), we maintain a bin directory in the wasm package, and copy the bin directory inside the temporary dist directory in the extension package.

[TalDerei]

@turbocrime can you check why lint:rust is failing the CI? seems like wasm-pack doesn't seem to be available in the environment where the @penumbra-zone/wasm package's compile script is being executed?

[turbocrime]

iirc there is a more 'conventional' way to bundle assets from a dependency in webpack. i don't have an example on hand but i will see what i can find later

[turbocrime]

excellent, i like how this leverages the pre/post auto-execute feature of npm. it might be more technically correct as a 'postcompile' or 'postbuild' script - or even 'pretest' 'prelint' or 'postinstall'

we might look at using more of these pre/post scripts for dependency management outside of turbo, which should be aware of them and manage cache appropriately - playwright-install before certain tests is another good candidate for this

[turbocrime]

1. it's preferable to use turbo cache for keys, to avoid redownloading keys at every CI step
2. it's preferable to use turbo cache for compile output, to avoid setting up compile tools for every CI step

[TalDerei]

@turbocrime is this in a mergeable state? feel free to make any changes

[turbocrime]

probably the wasm package should contain the key download script, and expose it to other packages via the 'bin' field

[turbocrime]

#872

[TalDerei]

closing in favor of #872