Add Functions gRPC core helpers #606

Job	Run time
e2e (query-restart, node 24.x)	1m 28s
e2e (query-restart, node 22.x)	1m 24s
e2e (retry-history-rewind, node 22.x)	2m 6s
e2e (entity, node 24.x)	3m 50s
e2e (retry-history-rewind, node 24.x)	1m 59s
e2e (orchestration, node 24.x)	3m 30s
e2e (orchestration, node 22.x)	3m 33s
e2e (entity, node 22.x)	3m 45s
	21m 35s

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