Register Reflection service on gRPC server

[cicoyle]

Description

Register reflection service on gRPC server, so that developers may debug more easily from the command line by running grpcurl commands. This addition saves developer time - they wont have to add this manually and rebuild dapr.

ex:

grpcurl -H 'dapr-app-id: sub' -d '{"pubsub_name":"fakeKafka", "topic":"fakeTopic"}' -plaintext localhost:57534 dapr.proto.runtime.v1.Dapr.PublishEvent
ERROR:
  Code: InvalidArgument
  Message: pubsub fakeKafka not found

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ec20c83) 64.98% compared to head (9817fb0) 64.95%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7215      +/-   ##
==========================================
- Coverage   64.98%   64.95%   -0.04%     
==========================================
  Files         221      221              
  Lines       20864    20865       +1     
==========================================
- Hits        13559    13553       -6     
- Misses       6158     6162       +4     
- Partials     1147     1150       +3     

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