PYTHON-1752 bulk_write should be able to accept a generator #2268

Job	Run time
Build wheels for manylinux_x86_64	2m 19s
Build wheels for manylinux_aarch64	11m 23s
Make SDist	35s
Build wheels for manylinux_ppc64le	10m 46s
Build wheels for manylinux_s390x	11m 22s
Build wheels for manylinux_i686	2m 50s
Build wheels for win_amd6	4m 8s
Build wheels for win32	8m 13s
Build wheels for macos	3m 28s
Download Wheels	8s
	55m 12s

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