[events API 1/2]: Add new send and receive streaming RPCs #2470

Job	Run time
Compilation check	33s
cross compilation	9m 7s
Docker build check	2m 54s
Format check	19s
run itests	7m 59s
run itests postgres	14m 10s
Lint check	2m 21s
go mod check	25s
RPC check	1m 29s
Sqlc check	20s
test vector check	55s
run unit tests (unit-race)	5m 25s
run unit tests (unit-cover)	3m 9s
run unit tests (unit dbbackend=postgres)	3m 59s
	53m 5s

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