refactor(wasm): remove wasm crate from monorepo

[TalDerei]

References #3819 and penumbra-zone/web#218

[TalDerei]

@grod220 the existing wasm crate is split into penumbra-wasm and penumbra-extension. The parts of the wasm crate that have logic live in penumbra-extension, and wasm-bindgen wrappers are in penumbra-wasm. Ideally, the dependency relation should be a one-way relationship where the extension crate in the web can depend on the wasm crate in the monorepo or any other crate, but the wasm crate shouldn't depend on the extension crate. Currently, the penumbra-wasm can't live in isolation since the dependency chain is a two-way relationship, where the wasm crate relies on dependencies from the extension crate.

[TalDerei]

Additionally, the wasm unit testing suite is currently broken from changes in a previous PR. I'll bisect to isolate the breakage.

[grod220]

Ah, thiserror (crates/wasm/src/error.rs) saved us when we refactored to handle errors and not unwrap everything. I have a feeling we'll want this code to stay with the wasm crate in the core repo and the extension crate will import it.

[TalDerei]

The wasm crate has been removed from the penumbra monorepo, and the onus to maintain the wasm stack explicitly and exclusively falls to the web team. The wasm code, existing CI workflows and testing infrastructure will be ported accordingly to the web side in penumbra-zone/web#478.

cc @grod220 @turbocrime @Valentine1898 @Vadim121197 @jessepinho

[TalDerei]

We'll wait to merge this until penumbra-zone/web#478 is in

[TalDerei]

@conorsch ready to merge on your green light

[conorsch]

This looks complete to my eye. Will check post-merge that workflows on main still pass, and clean up anything missed. Thanks for your liberal cross-linking, @TalDerei. Really helps to follow the history of discussion around this change, particularly in penumbra-zone/web#218.