Implement MultiThreadExecutor on Java API #2035

Job	Run time
build-by-clang	5m 57s
check-tidy	1m 15s
build-on-macos	14m 29s
build-on-windows-x64-uwp-x86-shared	11m 22s
build-test-debugger	4m 57s
build-test-on-x64-release (new-es octane v8)	9m 38s
build-test-on-android (x86, 28)	16m 16s
build-test-on-x64-release (new-es octane v8, -DESCARGOT_THREADING=ON -DESCARGOT_TCO=ON)	10m 18s
build-test-on-x86-release (octane)	9m 19s
build-test-on-android (x86_64, 28)	17m 3s
build-test-on-x64-release (chakracore spidermonkey)	10m 0s
build-test-on-x86-release (v8 chakracore spidermonkey)	9m 57s
build-test-on-x86-x64-debug	6m 19s
build-test-on-x64-release (chakracore spidermonkey, -DESCARGOT_THREADING=ON -DESCARGOT_TCO=ON)	8m 15s
build-test-on-x86-release (jetstream-only-simple-parallel-1)	13m 24s
build-test-on-x64-release (chakracore spidermonkey, -DESCARGOT_SMALL_CONFIG=ON -DESCARGOT_USE_CUS...	9m 44s
test-on-windows-clang-cl (x86, -m32)	13m 42s
build-test-on-x86-release (jetstream-only-simple-parallel-2 jsc-stress)	10m 15s
build-test-on-x86-release (jetstream-only-simple-parallel-3 jetstream-only-cdjs)	10m 21s
test-on-windows-x86-x64 (x86)	44m 19s
test-on-windows-x86-x64 (x64)	52m 4s
build-test-wasmjs	7m 53s
build-test-api	8m 24s
build-test-codecache	11m 14s
	5h 16m 25s

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