Create unified encoding/ decoding utilities

[lemonmade]

Should work across threads, serializations, and server module responses

Inspiration:

• https://github.com/rich-harris/devalue
• https://github.com/jacob-ebey/turbo-stream/blob/main/src/flatten.ts
• https://github.com/flightcontrolhq/superjson

[lemonmade]

https://github.com/lemonmade/quilt/issues/767