[WIP] Change PubsubIO sinks to use the proto message in their interfaces.#10481

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dpcollins-google wants to merge 6 commits intoapache:masterfrom

dpcollins-google:sink-use-protos

Commits on Dec 28, 2019

Move external PubsubIO hooks outside of PubsubIO.
dpcollins
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Remove optionality and add sensible defaults to PubsubIO builders.
git
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Move PubsubBoundedWriter outside of PubsubIO.
git
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Change the default pubsub client to the GRPC client from the json one.
git
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Extract IncomingMessage and OutgoingMessage from PubsubClient.
git
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Modify pubsub sinks to use the proto PubsubMessage internally, and add a public writeWireMessages() method to PubsubIO.
git
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