PYTHON-4834 Add repr to IndexModel, SearchIndexModel #986

Job	Run time
Make SDist	31s
Build wheels for manylinux_x86_64	2m 26s
Build wheels for manylinux_aarch64	10m 35s
Build wheels for manylinux_ppc64le	9m 53s
Build wheels for manylinux_s390x	10m 33s
Build wheels for manylinux_i686	2m 29s
Build wheels for win_amd6	4m 11s
Build wheels for win32	5m 45s
Build wheels for macos	2m 31s
Download Wheels	10s
	49m 4s

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