[DRAFT] Implement numcodecs-registry on wasm-guest

[juntyr]

• implement a meta-compressor codec that actually makes use of the registry
• decide on how to describe and inspect and map over meta compressors and sync with numcodecs-combinators
• implement support for optionally providing a registry to wasm codecs
• build the meta-compressor on wasm as well
• should the registry allow mutation? maybe not (specialised registries can) since that would cause all kinds of cross domain issues like cycles