refactor(serevr/v2/cometbft): update RegisterQueryHandlers and GRPC queries (backport #22403) (#22429)

Co-authored-by: Hieu Vu <72878483+hieuvubk@users.noreply.github.com>
Co-authored-by: Hieu Vu <hieuvubk@gmail.com>
Co-authored-by: Julien Robert <julien@rbrt.fr>

server/v2/cometbft/abci.go

@@ -259,12 +259,15 @@ func (c *Consensus[T]) maybeRunGRPCQuery(ctx context.Context, req *abci.QueryReq
 		return nil, false, err
 	}
 
+	var handlerFullName string
 	md, isGRPC := desc.(protoreflect.MethodDescriptor)
 	if !isGRPC {
-		return nil, false, nil
+		handlerFullName = string(desc.FullName())
+	} else {
+		handlerFullName = string(md.Input().FullName())
 	}
 
-	handler, found := c.queryHandlersMap[string(md.Input().FullName())]
+	handler, found := c.queryHandlersMap[handlerFullName]
 	if !found {
 		return nil, true, fmt.Errorf("no query handler found for %s", req.Path)
 	}
@@ -282,7 +285,7 @@ func (c *Consensus[T]) maybeRunGRPCQuery(ctx context.Context, req *abci.QueryReq
 	}
 
 	resp, err = queryResponse(res, req.Height)
-	return resp, isGRPC, err
+	return resp, true, err
 }
 
 // InitChain implements types.Application.