PYTHON-4590 - Add type guards to async API methods #437

Job	Run time
Make SDist	35s
Build wheels for manylinux_x86_64	2m 25s
Build wheels for manylinux_aarch64	10m 19s
Build wheels for manylinux_ppc64le	9m 46s
Build wheels for manylinux_s390x	10m 22s
Build wheels for manylinux_i686	2m 27s
Build wheels for win_amd6	5m 10s
Build wheels for win32	5m 20s
Build wheels for macos	3m 17s
Download Wheels	6s
	49m 47s

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