processor: Implement native processor metrics_selector #8853

Job	Run time
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, gcc)	12m 19s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, clang)	12m 25s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, gcc)	11m 48s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, clang)	11m 44s
run-ubuntu-unit-tests (-DFLB_SMALL=On, gcc)	11m 52s
run-ubuntu-unit-tests (-DFLB_SMALL=On, clang)	12m 53s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, gcc)	11m 55s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, clang)	11m 48s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, gcc)	12m 4s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, clang)	12m 8s
run-ubuntu-unit-tests (-DFLB_COVERAGE=On, gcc)	43m 51s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, gcc)	12m 7s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, clang)	11m 46s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, gcc)	11m 58s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, clang)	12m 12s
run-macos-unit-tests (-DFLB_JEMALLOC=Off)	14m 5s
run-macos-unit-tests (-DFLB_SANITIZE_MEMORY=On)	10m 42s
run-macos-unit-tests (-DFLB_SANITIZE_THREAD=On)	10m 35s
Unit tests (matrix)	1s
	4h 8m 13s

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