bench: `rkyv` as a (de)serializer

[Autoparallel]

Tasks

We currently are using FastSerde to do (de)serialization because found this was extremely slow in WASM in particular. I would like to suggest using rkyv which is a zero-copy serde lib.

• Make a benchmark comparing deserialization performance of FastSerde, bincode, and rkyv in the browser context. We should find:
  • Bincode is quite slow taking tens of seconds to deserialize a handful of megabytes (10-50MB).
  • FastSerde likely the fastest
  • rkyv (hopefully) barely slower than FastSerde or ideally faster.

Science!