[Backport release-1.8] [python] Implement `IntIndexer` as class that wraps around `clib.IntIndexer` #407

Job	Run time
macos TILEDB_EXISTS: no TILEDBSOMA_EXISTS: no	1s
macos TILEDB_EXISTS: no TILEDBSOMA_EXISTS: no	7m 44s
docker TILEDB_EXISTS: no TILEDBSOMA_EXISTS: no	4m 51s
docker TILEDB_EXISTS: no TILEDBSOMA_EXISTS: no	4m 51s
ubuntu-22.04 setuptools	4m 44s
ubuntu-22.04 setuptools	4m 44s
docker TILEDB_EXISTS: yes TILEDBSOMA_EXISTS: no	4m 35s
docker TILEDB_EXISTS: yes TILEDBSOMA_EXISTS: no	4m 35s
macos-12 setuptools	1s
macos-12 setuptools	12m 37s
docker TILEDB_EXISTS: yes TILEDBSOMA_EXISTS: yes	4m 42s
docker TILEDB_EXISTS: yes TILEDBSOMA_EXISTS: yes	4m 42s
macos TILEDB_EXISTS: yes TILEDBSOMA_EXISTS: no	1s
macos TILEDB_EXISTS: yes TILEDBSOMA_EXISTS: no	5m 53s
macos TILEDB_EXISTS: yes TILEDBSOMA_EXISTS: yes	1s
macos TILEDB_EXISTS: yes TILEDBSOMA_EXISTS: yes	6m 17s
	1h 10m 19s

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