Bring your own codec

Hi,

i'm building a set of crates that until now hooked in tonic codec for a custom encoding/decoding experience: https://codeberg.org/cemoktra/gin-tonic

Basically i'm providing a protobuf option to directly use your real types in protobuf message structs, a trait for defining how this is encoded on protobuf scalar values and a code generator for this.

I was now scimming the traits exposed by the new library, and it seems there is no such thing as the Codec trait anymore.

That leads to my main question of, to plan to re-integrate that?