Grouper, Resampler as public api #12218

Job	Run time
detect ci trigger	5s
Event File	2s
ubuntu-latest py3.9	1m 3s
ubuntu-latest py3.11	2m 47s
ubuntu-latest py3.12	2m 32s
macos-latest py3.9	2m 29s
macos-latest py3.11	2m 29s
macos-latest py3.12	2m 34s
windows-latest py3.9	2m 30s
windows-latest py3.11	2m 29s
windows-latest py3.12	2m 32s
ubuntu-latest py3.9 bare-minimum	2m 33s
ubuntu-latest py3.9 min-all-deps	2m 35s
ubuntu-latest py3.10 all-but-dask	2m 32s
ubuntu-latest py3.10 flaky	2m 34s
	31m 46s

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