out_kafka: Add dynamic/static headers support #9515

Job	Run time
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, gcc)	12m 58s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, clang)	13m 4s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, gcc)	12m 29s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, clang)	12m 21s
run-ubuntu-unit-tests (-DFLB_SMALL=On, gcc)	12m 31s
run-ubuntu-unit-tests (-DFLB_SMALL=On, clang)	13m 12s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, gcc)	12m 35s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, clang)	12m 24s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, gcc)	12m 29s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, clang)	12m 35s
run-ubuntu-unit-tests (-DFLB_COVERAGE=On, gcc)	44m 54s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, gcc)	12m 17s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, clang)	12m 23s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, gcc)	12m 19s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, clang)	12m 7s
run-macos-unit-tests (-DFLB_JEMALLOC=Off)	12m 13s
run-macos-unit-tests (-DFLB_SANITIZE_MEMORY=On)	12m 31s
run-macos-unit-tests (-DFLB_SANITIZE_THREAD=On)	12m 41s
Unit tests (matrix)	1s
	4h 18m 4s

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