MAINT cleanup utils.__init__: move chunking tools into dedicated submodule #28516
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Extracted from #26686 to ease the reviews. The end goal is to clean the utils.init.py module as explained in the linked PR.
I didn't find a relevant already existing module to move
_chunk_generator,gen_batches,gen_even_slicesandget_chunk_n_rowsinto so I created a dedicatedutils._chunkingsubmodule.gen_batches,gen_even_slicesare public so I kept them importable fromutils._chunk_generatorandget_chunk_n_rowsare not listed inclasses.rstso assumed private, thus I made them only importable fromutils._chunking.I also took the opportunity to rename
_chunk_generatorintochunk_generatorsince there's no need to multiply the leading underscores: it already comes from a private module.