Revives #14024 and additionally supports,
Native queries
gRPC health check endpoint
This PR doesn't have the shaded module for packaging gRPC and Guava libraries since grpc-query module uses the same Guava version as that of Druid.
The response is gRPC-specific. It provides the result schema along with the results as a binary "blob". Results can be in CSV, JSON array lines or as an array of Protobuf objects. If using Protobuf, the corresponding class must be installed along with the gRPC query extension so it is available to the Broker at runtime.
Rishabh Singh