[sql-15] sessions: various functional options for NewSession #2127

Job	Run time
check commits	52s
backend build on ubuntu-latest	3m 17s
frontend tests on ubuntu-latest	2m 17s
backend build on windows-latest	15m 20s
frontend tests on windows-latest	9m 9s
cross compilation (i386, linux-386)	3m 7s
backend build on macOS-latest	4m 27s
frontend tests on macOS-latest	2m 38s
integration test (bbolt, dbbackend=bbolt)	18m 8s
cross compilation (amd64, darwin-amd64 linux-amd64 windows-amd64)	8m 7s
cross compilation (arm, darwin-arm64 linux-armv6 linux-armv7 linux-arm64)	10m 28s
lint	2m 19s
RPC proto compilation check	3m 41s
check release notes updated	0s
integration test (sqlite, dbbackend=sqlite)	18m 45s
integration test (postgres, dbbackend=postgres)	21m 54s
Sqlc check	35s
run unit tests (unit-race)	4m 6s
run unit tests (unit)	51s
run unit tests (unit dbbackend=postgres)	1m 36s
run unit tests (unit dbbackend=sqlite)	49s
	2h 12m 26s

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