PYTHON-4834 Add repr to IndexModel, SearchIndexModel #957

Job	Run time
Make SDist	36s
Build wheels for manylinux_x86_64	2m 21s
Build wheels for manylinux_aarch64	11m 2s
Build wheels for manylinux_ppc64le	10m 5s
Build wheels for manylinux_s390x	10m 49s
Build wheels for manylinux_i686	2m 14s
Build wheels for win_amd6	4m 11s
Build wheels for win32	4m 29s
Build wheels for macos	2m 31s
Download Wheels	9s
	48m 27s

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