[Chore]: Ensure prost protobuf serialization is deterministic

[matteojug]

Chore - Ensure prost protobuf serialization is deterministic

1. Description

In #957 we rely on prost -- instead of the proto3 standard -- for deterministic serialization, as we need it to sign proto messages. We did check such assumption for some types and checked the implementation, but we need to ensure this is true for all the types.

Refs

https://protobuf.dev/programming-guides/encoding/#implications