Makefile: add `release-tag` target with SemVer validation #2784

Job	Run time
run LiT unit tests	2m 42s
SQL compilation check	8s
go mod check	9m 30s
run LiT itests	11m 34s
run unit-test postgres race	10m 45s
RPC compilation check	1m 40s
verify that auto-generated documentation is up-to-date	30s
run unit-test sqlite3 race	9m 0s
build and lint code	4m 56s
	50m 45s

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