Initial version of an external table reader interface #4382

Job	Run time
build-linux-cmake-with-folly-lite-no-test	7m 41s
build-linux-make-with-folly	28m 59s
build-linux	16m 54s
check-format-and-targets	27s
build-linux-make-with-folly-lite-no-test	9m 43s
build-examples	10m 18s
build-linux-cmake-mingw	11m 58s
build-linux-cmake-with-benchmark	18m 33s
build-linux-cmake-with-folly	27m 50s
build-linux-cmake-with-folly-coroutines	31m 8s
build-linux-encrypted_env-no_compression	15m 48s
build-linux-release	13m 53s
build-linux-release-rtti	12m 30s
build-fuzzers	9m 14s
build-linux-clang10-asan	17m 5s
build-linux-clang10-clang-analyze	17m 50s
build-linux-clang10-ubsan	17m 7s
build-linux-clang-13-no_test_run	7m 28s
build-linux-clang-no_test_run	12m 24s
build-linux-gcc-10-cxx20-no_test_run	9m 39s
build-linux-gcc-11-no_test_run	10m 36s
build-linux-gcc-8-no_test_run	8m 40s
build-linux-mini-crashtest	29m 15s
build-linux-unity-and-headers	12m 28s
build-linux-arm	13m 43s
build-linux-clang13-mini-tsan	21m 53s
build-linux-java	15m 3s
build-linux-java-static	11m 25s
build-linux-static_lib-alt_namespace-status_checked	19m 2s
build-linux-java-pmd	12m 1s
build-macos	19m 51s
build-macos-cmake (true)	49m 18s
build-macos-java	18m 4s
build-macos-cmake (false)	40m 48s
build-macos-java-static	22m 8s
build-macos-java-static-universal	28m 41s
build-windows-vs2019	20m 41s
	10h 50m 6s

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