## Description 

Migrates everything except RocksDB keys, which rely on the big-endian
fixint encoding from bincode.

Also adds snappy compression to the anemo network codec.

Fixes issue #8714.

## Test Plan 

Updated tests.

---
If your changes are not user-facing and not a breaking change, you can
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### Type of Change (Check all that apply)

- [ ] user-visible impact
- [ ] breaking change for a client SDKs
- [x] breaking change for FNs (FN binary must upgrade)
- [x] breaking change for validators or node operators (must upgrade
binaries)
- [ ] breaking change for on-chain data layout
- [x] necessitate either a data wipe or data migration

### Release notes

Serialization format for RPCs and DB storage changed. Binaries must all
be updated in order to use the same, new format.