fix(JS: BitSet): Export the BitSet class #1170

Job	Run time
cpp-lib-build (macos-12, clang, ON)	1s
cpp-lib-build (macos-12, clang, OFF)	1s
build (macos-12, tool)	1s
cpp-lib-build (macos-12, gcc, ON)	1s
build (macos-12, cpp)	1s
cpp-lib-build (macos-12, gcc, OFF)	1s
build (macos-12, csharp)	1s
cpp-lib-build (ubuntu-20.04, clang, ON)	2m 44s
build (macos-12, dart)	1s
cpp-lib-build (ubuntu-20.04, clang, OFF)	4m 32s
build (macos-12, go)	1s
build (macos-12, java)	1s
cpp-lib-build (ubuntu-20.04, gcc, ON)	2m 25s
build (macos-12, javascript)	1s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	4m 11s
build (macos-12, typescript)	1s
cpp-lib-build (windows-2022, clang, ON)	4m 28s
build (macos-12, php)	1s
cpp-lib-build (windows-2022, clang, OFF)	5m 33s
build (macos-12, python3)	1s
cpp-lib-build (windows-2022, cl)	3m 59s
build (ubuntu-20.04, tool)	3m 28s
build (ubuntu-20.04, cpp)	17m 49s
build (ubuntu-20.04, csharp)	5m 25s
build (ubuntu-20.04, dart)	4m 19s
build (ubuntu-20.04, go)	2m 38s
build (ubuntu-20.04, java)	1m 25s
build (ubuntu-20.04, javascript)	1m 56s
build (ubuntu-20.04, typescript)	10m 19s
build (ubuntu-20.04, php)	1m 29s
build (ubuntu-20.04, python3)	1m 18s
build (windows-2022, tool)	3m 54s
build (windows-2022, cpp)	23m 6s
build (windows-2022, csharp)	7m 27s
build (windows-2022, dart)	4m 28s
build (windows-2022, go)	5m 42s
build (windows-2022, java)	2m 4s
build (windows-2022, javascript)	2m 49s
build (windows-2022, typescript)	19m 41s
build (windows-2022, php)	1m 58s
build (windows-2022, python3)	1m 59s
	2h 31m 20s

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