Update Protos, Java SDK, Golang SDK to support Project Namespacing

[woop]

Rebased on #361

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: woop

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[feast-ci-bot]

@woop: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
test-core-and-ingestion	5b554c3	link	/test test-core-and-ingestion
test-serving	5b554c3	link	/test test-serving
test-python-sdk	5b554c3	link	/test test-python-sdk
test-end-to-end	5b554c3	link	/test test-end-to-end
test-end-to-end-batch	5b554c3	link	/test test-end-to-end-batch

Full PR test history

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