All wire formats should be protobuf

[vigith]

Summary

We use encoding/binary for serde. We need to standardize on a wire format that is scalable and also supports backward compatibility. encoding/binary encourages using gob or protobuf; I think protobuf has more benefits than gob because it is language agnostic and streaming is not implicit.

Use Cases

• Backward compatibility
• Language agnostic
• Scalable

Affected components

### Components to change
- [ ] #1768 
- [ ] #1779 
- [ ] WAL storage serde using protobuf

---

Message from the maintainers:

If you wish to see this enhancement implemented please add a 👍 reaction to this issue! We often sort issues this way to know what to prioritize.