feat(generic): support grpc json generic for client

[Marina-Sakai]

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[codecov]

Codecov Report

Attention: Patch coverage is 31.92982% with 194 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-v0.11.0@7832739). Learn more about missing BASE report.

❗ Current head b84656f differs from pull request most recent head 7b98b9b

Please upload reports for the commit 7b98b9b to get more accurate results.

Files	Patch %	Lines
client/genericclient/stream.go	0.00%	107 Missing ⚠️
server/genericserver/stream.go	0.00%	28 Missing ⚠️
pkg/generic/generic_stream_service.go	0.00%	24 Missing ⚠️
pkg/generic/grpcjsonpb_test/generic_init.go	78.20%	10 Missing and 7 partials ⚠️
pkg/remote/codec/grpc/grpc.go	0.00%	15 Missing ⚠️
pkg/generic/thrift/parse.go	86.66%	1 Missing and 1 partial ⚠️
pkg/generic/httppbthrift_codec.go	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##             release-v0.11.0    #1411   +/-   ##
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  Coverage                   ?   69.75%           
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  Files                      ?      300           
  Lines                      ?    21505           
  Branches                   ?        0           
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  Hits                       ?    15000           
  Misses                     ?     5274           
  Partials                   ?     1231           

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[Marina-Sakai]

note: stream serviceInfo for server side will requires to import genericserver package, which will lead cyclic import. So need to handle it when supporting server side grpc generic.

[Marina-Sakai]

it would be better to define client stream serviceInfo and server stream serviceInfo separately in genericclient/genericserver package.

[jayantxie]

LGTM