program: add gRPC data ingester#4411

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wchargin merged 8 commits intomasterfrom

wchargin-grpc-ingester

Dec 5, 2020

Commits on Dec 2, 2020

[update diffbase: grpc-ingester]
wchargin
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Commits on Dec 3, 2020

Commits on Dec 4, 2020

[grpc-ingester: update diffbase]
wchargin
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