PYTHON-4590 - Add type guards to async API methods #426

Job	Run time
Build wheels for manylinux_x86_64	2m 27s
Build wheels for manylinux_aarch64	10m 25s
Make SDist	37s
Build wheels for manylinux_ppc64le	9m 34s
Build wheels for manylinux_s390x	10m 33s
Build wheels for manylinux_i686	2m 37s
Build wheels for win_amd6	5m 45s
Build wheels for win32	4m 12s
Build wheels for macos	3m 20s
Download Wheels	7s
	49m 37s

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