docs+scripts+.github: add release notes template and a GH check #1506

Job	Run time
check commits	42s
integration test	9m 10s
backend build on ubuntu-latest	5m 28s
frontend tests on ubuntu-latest	2m 8s
lint	1m 38s
frontend tests on windows-latest	5m 6s
RPC proto compilation check	4m 14s
frontend tests on macOS-latest	2m 17s
backend build on windows-latest	12m 9s
check release notes updated	4s
backend build on macOS-latest	4m 39s
unit tests	21s
unit-race	22s
	48m 18s

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