PYTHON-3636 MongoClient should perform SRV resolution lazily #1941

Job	Run time
Make SDist	39s
Build wheels for manylinux_x86_64	1m 47s
Build wheels for manylinux_aarch64	1m 45s
Build wheels for manylinux_ppc64le	1m 47s
Build wheels for manylinux_s390x	1m 47s
Build wheels for manylinux_i686	1m 45s
Build wheels for win_amd6	1m 37s
Build wheels for win32	1m 38s
Build wheels for macos	1m 47s
Download Wheels	1s
	14m 33s

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