PYTHON-3636 MongoClient should perform SRV resolution lazily #1903

Job	Run time
Build wheels for manylinux_x86_64	2m 11s
Build wheels for manylinux_aarch64	11m 31s
Make SDist	29s
Build wheels for manylinux_ppc64le	10m 50s
Build wheels for manylinux_s390x	11m 10s
Build wheels for manylinux_i686	2m 39s
Build wheels for win_amd6	4m 31s
Build wheels for win32	5m 9s
Build wheels for macos	4m 10s
Download Wheels	6s
	52m 46s

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