feat: exchange gRPC server implementation to connectRPC (#10145)

# Which Problems Are Solved

The current maintained gRPC server in combination with a REST (grpc)
gateway is getting harder and harder to maintain. Additionally, there
have been and still are issues with supporting / displaying `oneOf`s
correctly.
We therefore decided to exchange the server implementation to
connectRPC, which apart from supporting connect as protocol, also also
"standard" gRCP clients as well as HTTP/1.1 / rest like clients, e.g.
curl directly call the server without any additional gateway.

# How the Problems Are Solved

- All v2 services are moved to connectRPC implementation. (v1 services
are still served as pure grpc servers)
- All gRPC server interceptors were migrated / copied to a corresponding
connectRPC interceptor.
- API.ListGrpcServices and API. ListGrpcMethods were changed to include
the connect services and endpoints.
- gRPC server reflection was changed to a `StaticReflector` using the
`ListGrpcServices` list.
- The `grpc.Server` interfaces was split into different combinations to
be able to handle the different cases (grpc server and prefixed gateway,
connect server with grpc gateway, connect server only, ...)
- Docs of services serving connectRPC only with no additional gateway
(instance, webkey, project, app, org v2 beta) are changed to expose that
- since the plugin is not yet available on buf, we download it using
`postinstall` hook of the docs

# Additional Changes

- WebKey service is added as v2 service (in addition to the current
v2beta)

# Additional Context

closes #9483

---------

Co-authored-by: Elio Bischof <elio@zitadel.com>

internal/api/grpc/user/v2/u2f.go

@@ -3,50 +3,52 @@ package user
 import (
 	"context"
 
+	"connectrpc.com/connect"
+
 	"github.com/zitadel/zitadel/internal/api/grpc/object/v2"
 	"github.com/zitadel/zitadel/internal/domain"
 	"github.com/zitadel/zitadel/internal/zerrors"
 	"github.com/zitadel/zitadel/pkg/grpc/user/v2"
 )
 
-func (s *Server) RegisterU2F(ctx context.Context, req *user.RegisterU2FRequest) (*user.RegisterU2FResponse, error) {
+func (s *Server) RegisterU2F(ctx context.Context, req *connect.Request[user.RegisterU2FRequest]) (*connect.Response[user.RegisterU2FResponse], error) {
 	return u2fRegistrationDetailsToPb(
-		s.command.RegisterUserU2F(ctx, req.GetUserId(), "", req.GetDomain()),
+		s.command.RegisterUserU2F(ctx, req.Msg.GetUserId(), "", req.Msg.GetDomain()),
 	)
 }
 
-func u2fRegistrationDetailsToPb(details *domain.WebAuthNRegistrationDetails, err error) (*user.RegisterU2FResponse, error) {
+func u2fRegistrationDetailsToPb(details *domain.WebAuthNRegistrationDetails, err error) (*connect.Response[user.RegisterU2FResponse], error) {
 	objectDetails, options, err := webAuthNRegistrationDetailsToPb(details, err)
 	if err != nil {
 		return nil, err
 	}
-	return &user.RegisterU2FResponse{
+	return connect.NewResponse(&user.RegisterU2FResponse{
 		Details:                            objectDetails,
 		U2FId:                              details.ID,
 		PublicKeyCredentialCreationOptions: options,
-	}, nil
+	}), nil
 }
 
-func (s *Server) VerifyU2FRegistration(ctx context.Context, req *user.VerifyU2FRegistrationRequest) (*user.VerifyU2FRegistrationResponse, error) {
-	pkc, err := req.GetPublicKeyCredential().MarshalJSON()
+func (s *Server) VerifyU2FRegistration(ctx context.Context, req *connect.Request[user.VerifyU2FRegistrationRequest]) (*connect.Response[user.VerifyU2FRegistrationResponse], error) {
+	pkc, err := req.Msg.GetPublicKeyCredential().MarshalJSON()
 	if err != nil {
 		return nil, zerrors.ThrowInternal(err, "USERv2-IeTh4", "Errors.Internal")
 	}
-	objectDetails, err := s.command.HumanVerifyU2FSetup(ctx, req.GetUserId(), "", req.GetTokenName(), "", pkc)
+	objectDetails, err := s.command.HumanVerifyU2FSetup(ctx, req.Msg.GetUserId(), "", req.Msg.GetTokenName(), "", pkc)
 	if err != nil {
 		return nil, err
 	}
-	return &user.VerifyU2FRegistrationResponse{
+	return connect.NewResponse(&user.VerifyU2FRegistrationResponse{
 		Details: object.DomainToDetailsPb(objectDetails),
-	}, nil
+	}), nil
 }
 
-func (s *Server) RemoveU2F(ctx context.Context, req *user.RemoveU2FRequest) (*user.RemoveU2FResponse, error) {
-	objectDetails, err := s.command.HumanRemoveU2F(ctx, req.GetUserId(), req.GetU2FId(), "")
+func (s *Server) RemoveU2F(ctx context.Context, req *connect.Request[user.RemoveU2FRequest]) (*connect.Response[user.RemoveU2FResponse], error) {
+	objectDetails, err := s.command.HumanRemoveU2F(ctx, req.Msg.GetUserId(), req.Msg.GetU2FId(), "")
 	if err != nil {
 		return nil, err
 	}
-	return &user.RemoveU2FResponse{
+	return connect.NewResponse(&user.RemoveU2FResponse{
 		Details: object.DomainToDetailsPb(objectDetails),
-	}, nil
+	}), nil
 }