Add a dedicated API for KNN search #4234

Job	Run time
build-linux-cmake-mingw	11m 46s
build-linux	16m 55s
build-examples	10m 14s
build-linux-cmake-with-folly	27m 13s
build-linux-cmake-with-benchmark	19m 3s
build-linux-cmake-with-folly-coroutines	31m 5s
build-linux-cmake-with-folly-lite-no-test	7m 33s
build-linux-encrypted_env-no_compression	15m 53s
build-linux-make-with-folly	28m 15s
build-linux-release-rtti	12m 11s
check-format-and-targets	24s
build-fuzzers	8m 53s
build-linux-clang10-asan	17m 18s
build-linux-clang10-clang-analyze	17m 49s
build-linux-clang10-ubsan	17m 11s
build-linux-clang13-mini-tsan	22m 3s
build-linux-clang-13-no_test_run	7m 34s
build-linux-clang-no_test_run	12m 38s
build-linux-gcc-10-cxx20-no_test_run	9m 44s
build-linux-gcc-11-no_test_run	10m 30s
build-linux-gcc-8-no_test_run	8m 50s
build-linux-make-with-folly-lite-no-test	9m 30s
build-linux-mini-crashtest	30m 9s
build-linux-release	13m 47s
build-linux-unity-and-headers	12m 51s
build-macos	23m 18s
build-linux-arm	10m 10s
build-linux-java	14m 43s
build-linux-java-pmd	11m 31s
build-linux-java-static	11m 49s
build-linux-static_lib-alt_namespace-status_checked	19m 14s
build-macos-cmake (true)	1h 7m 56s
build-macos-java-static	22m 3s
build-macos-java	15m 53s
build-macos-cmake (false)	42m 57s
build-macos-java-static-universal	22m 18s
build-windows-vs2019	53m 0s
	11h 34m 11s

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