PYTHON-1752 bulk_write should be able to accept a generator #2250

Job	Run time
Build wheels for manylinux_x86_64	2m 31s
Make SDist	32s
Build wheels for manylinux_aarch64	11m 24s
Build wheels for manylinux_ppc64le	10m 41s
Build wheels for manylinux_s390x	11m 17s
Build wheels for manylinux_i686	2m 33s
Build wheels for win_amd6	5m 15s
Build wheels for win32	4m 7s
Build wheels for macos	3m 52s
Download Wheels	7s
	52m 19s

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