Add subpackages

[thesmartwon]

Would it be possible to use subpackages for each encoding scheme? This would save downloading all the schemes I'm uninterested in.

For example:

import { CborEncoder, CborDecoder } from "@jsonjoy.com/json-pack-cbor";

would only download the necessary packages from NPM instead of ones for bson, ion, json, msgpack, ubjson and others.

[streamich]

This would be nice, in theory, but currently there is no resources for this and potentially this is premature for this project.