PYTHON-4834 Add repr to IndexModel, SearchIndexModel #1005

Job	Run time
Make SDist	46s
Build wheels for manylinux_x86_64	2m 11s
Build wheels for manylinux_aarch64	10m 27s
Build wheels for manylinux_ppc64le	10m 20s
Build wheels for manylinux_s390x	10m 48s
Build wheels for manylinux_i686	2m 39s
Build wheels for win_amd6	4m 29s
Build wheels for win32	5m 3s
Build wheels for macos	2m 35s
Download Wheels	11s
	49m 29s

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