Add Functions gRPC core helpers #605

Job	Run time
e2e (retry-history-rewind, node 24.x)	2m 1s
e2e (entity, node 22.x)	3m 43s
e2e (entity, node 24.x)	3m 47s
e2e (query-restart, node 24.x)	1m 27s
e2e (orchestration, node 24.x)	3m 38s
e2e (orchestration, node 22.x)	3m 39s
e2e (retry-history-rewind, node 22.x)	2m 6s
e2e (query-restart, node 22.x)	1m 29s
	21m 50s

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