PYTHON-4834 Add repr to IndexModel, SearchIndexModel #1004

Job	Run time
Make SDist	39s
Build wheels for manylinux_x86_64	2m 15s
Build wheels for manylinux_aarch64	11m 9s
Build wheels for manylinux_ppc64le	9m 55s
Build wheels for manylinux_s390x	10m 32s
Build wheels for manylinux_i686	2m 17s
Build wheels for win_amd6	4m 44s
Build wheels for win32	4m 58s
Build wheels for macos	3m 9s
Download Wheels	10s
	49m 48s

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