[PoC] Implement Metric Producer specification #2603

Job	Run time
build-graal	10m 53s
Build (macos-latest, 8)	10m 45s
Build (macos-latest, 11)	14m 47s
Build (macos-latest, 17)	13m 13s
Build (macos-latest, 19)	11m 37s
Build (ubuntu-20.04, 8)	16m 4s
Build (ubuntu-20.04, 11)	13m 29s
Build (ubuntu-20.04, 17)	14m 41s
Build (ubuntu-20.04, 19)	15m 5s
misspell-check / misspell-check	6s
markdown-link-check / markdown-link-check	31s
required-status-check	1s
publish-snapshots (skipped)	6s
	2h 1m 18s

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