[python] Drop `anndata` version pin; use `CSCDataset`/`CSRDataset` #775

Job	Run time
SO copying (macos) TILEDB_EXISTS: no TILEDBSOMA_EXISTS: no	9m 2s
setuptools (ubuntu-22.04)	5m 47s
SO copying (macos) TILEDB_EXISTS: yes TILEDBSOMA_EXISTS: no	11m 57s
SO copying (docker) TILEDB_EXISTS: no TILEDBSOMA_EXISTS: no	5m 36s
setuptools (macos-12)	9m 2s
SO copying (docker) TILEDB_EXISTS: yes TILEDBSOMA_EXISTS: no	5m 43s
SO copying (macos) TILEDB_EXISTS: yes TILEDBSOMA_EXISTS: yes	10m 31s
SO copying (docker) TILEDB_EXISTS: yes TILEDBSOMA_EXISTS: yes	5m 33s
Wheel from sdist (ubuntu-22.04)	4m 29s
Wheel from sdist (macos-12)	8m 56s
	1h 16m 36s

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