Add SSE style delimiting for message streaming

[numanelahi]

The response_to_json_translator currently supports streaming the messages as JSON array or as new line delimited. This PR adds support for enforcing Server-Sent Events (SSE) message framing (data: <message>\n\n) for streamed messages.

[google-oss-prow]

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[numanelahi]

/test all

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[gopkarthik]

/ok-to-test

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[numanelahi]

/test all

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[gopkarthik]

/ok-to-test

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[numanelahi]

/test all

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[gopkarthik]

/ok-to-test

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[gopkarthik]

/approve

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: gopkarthik, numanelahi

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