Move to generated type bindings

[nuzzles]

Lottie 1.0 officially released last week, and came with a comprehensive lottie spec JSON schema.

https://lottie.github.io/lottie-spec/latest/specs/schema/

There is a library called typify we can use to export rust bindings for this schema to replace the serde parser.

[nuzzles]

This is on hold for lottie/lottie-spec#157