to_dict for Codecs

[ilan-gold]

I noticed that some of the codecs here do not have to_dict methods like the ones in https://github.com/zarr-developers/zarr-python/tree/main/src/zarr/codecs which allow for quick json serialization from what I can tell. This feature helps make pipeline state serializable (see ilan-gold/zarrs-python#66). Is there interest in this feature? Seems like it would be relatively straightforward.

[ilan-gold]

Ah apologies, I misread my own error on this one. I am not sure if this is preventing serialization. My issue was expecting a to_dict method in a different context.