Allow for Customizable DB Open Hooks for DB Bench #4192

Job	Run time
build-linux	16m 27s
build-linux-cmake-mingw	11m 54s
build-linux-cmake-with-folly	27m 17s
build-linux-cmake-with-benchmark	19m 10s
build-linux-cmake-with-folly-coroutines	30m 57s
build-linux-cmake-with-folly-lite-no-test	7m 30s
build-linux-encrypted_env-no_compression	15m 53s
build-linux-make-with-folly	28m 9s
build-linux-make-with-folly-lite-no-test	9m 42s
check-format-and-targets	28s
build-examples	10m 20s
build-fuzzers	8m 52s
build-linux-release	14m 4s
build-linux-clang10-asan	17m 5s
build-linux-clang10-clang-analyze	17m 56s
build-linux-clang10-ubsan	17m 6s
build-linux-clang-13-no_test_run	7m 37s
build-linux-clang-no_test_run	12m 23s
build-linux-gcc-10-cxx20-no_test_run	9m 39s
build-linux-gcc-11-no_test_run	10m 34s
build-linux-gcc-8-no_test_run	8m 35s
build-linux-mini-crashtest	48m 8s
build-linux-release-rtti	11m 45s
build-linux-static_lib-alt_namespace-status_checked	18m 39s
build-linux-unity-and-headers	12m 52s
build-linux-arm	13m 39s
build-linux-clang13-mini-tsan	22m 1s
build-linux-java	14m 53s
build-linux-java-pmd	11m 36s
build-linux-java-static	11m 0s
build-macos	20m 2s
build-macos-cmake (true)	42m 47s
build-macos-java	18m 54s
build-macos-cmake (false)	50m 0s
build-macos-java-static	22m 57s
build-macos-java-static-universal	23m 22s
build-windows-vs2019	53m 34s
	11h 37m 47s

Provide feedback