processor: Implement native processor metrics_selector #8854

Job	Run time
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, gcc)	12m 31s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, clang)	12m 18s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, gcc)	12m 24s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, clang)	11m 40s
run-ubuntu-unit-tests (-DFLB_SMALL=On, gcc)	11m 49s
run-ubuntu-unit-tests (-DFLB_SMALL=On, clang)	12m 37s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, gcc)	11m 55s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, clang)	11m 38s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, gcc)	11m 57s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, clang)	11m 57s
run-ubuntu-unit-tests (-DFLB_COVERAGE=On, gcc)	44m 14s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, gcc)	11m 39s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, clang)	11m 41s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, gcc)	11m 37s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, clang)	11m 43s
run-macos-unit-tests (-DFLB_JEMALLOC=Off)	10m 16s
run-macos-unit-tests (-DFLB_SANITIZE_MEMORY=On)	10m 55s
run-macos-unit-tests (-DFLB_SANITIZE_THREAD=On)	10m 26s
Unit tests (matrix)	1s
	4h 3m 18s

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