Add ConfigurableMetricReaderProvider SPI #2812

Job	Run time
build-graal	7m 47s
Build (macos-latest, 8)	10m 50s
Build (macos-latest, 11)	9m 46s
Build (macos-latest, 17)	10m 9s
Build (macos-latest, 20)	11m 16s
Build (ubuntu-latest, 8)	9m 36s
Build (ubuntu-latest, 11)	10m 16s
Build (ubuntu-latest, 17)	8m 54s
Build (ubuntu-latest, 20)	8m 47s
Build (ubuntu-20.04, 17, true)	9m 30s
markdown-link-check / markdown-link-check	38s
misspell-check / misspell-check	5s
publish-snapshots (skipped)	6s
required-status-check	1s
	1h 37m 41s

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