Support rechunking to a frequency. #13475

Job	Run time
Event File	3s
detect ci trigger	6s
ubuntu-latest py3.9	8m 22s
ubuntu-latest py3.12	10m 14s
macos-latest py3.9	6m 50s
macos-latest py3.12	8m 10s
windows-latest py3.9	14m 54s
windows-latest py3.12	17m 2s
ubuntu-latest py3.9 bare-minimum	2m 2s
ubuntu-latest py3.9 min-all-deps	7m 13s
ubuntu-latest py3.11 all-but-dask	7m 24s
ubuntu-latest py3.12 flaky	1m 47s
	1h 24m 7s

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