v5.7.0
This PR updates the project to use tonic v0.14 and aligns dependencies and tooling accordingly. - Updated tonic and related prost dependencies, moving them to the relevant zitadel-gen crate. - Adapted the CI pipeline to leverage Buf's remote plugins, removing the direct `protoc` GitHub Action. - Updated the gRPC API to be compatible with the latest 2.x API specifications. - Applied minor formatting fixes.