PYTHON-1752 bulk_write should be able to accept a generator #2279

Job	Run time
Make SDist	32s
Build wheels for manylinux_x86_64	2m 27s
Build wheels for manylinux_aarch64	11m 40s
Build wheels for manylinux_ppc64le	10m 59s
Build wheels for manylinux_s390x	11m 27s
Build wheels for manylinux_i686	2m 27s
Build wheels for win_amd6	5m 10s
Build wheels for win32	4m 55s
Build wheels for macos	3m 38s
Download Wheels	6s
	53m 21s

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