feature: Added Get Block. Refined getBlock()

Author: a-saksena

server/src/main/java/com/hedera/block/server/BlockStreamService.java

@@ -7,6 +7,8 @@
 
 import java.util.logging.Logger;
 
+import static io.helidon.webserver.grpc.ResponseHelper.complete;
+
 
 public class BlockStreamService implements GrpcService {
 
@@ -30,7 +32,10 @@ public void update(Routing routing) {
     // @Override void invoke(ReqT request, StreamObserver<RespT> responseObserver);
 
     private void getBlock(BlockStreamServiceGrpcProto.BlockRequest request, StreamObserver<BlockStreamServiceGrpcProto.Block> responseObserver) {
+        String message = "GET BLOCK RESPONSE! ";
         logger.info("GetBlock request received");
+        BlockStreamServiceGrpcProto.Block response = BlockStreamServiceGrpcProto.Block.newBuilder().setValue(message).build();
+        complete(responseObserver, response);
     }