Need a chunker for cycles

[gmaze]

As of now, argopy supports chunking along latitude/longitude/depth/time/wmo but not cycle numbers !

This was not necessary for the 'phy' dataset (core/deep data) but this is no longer the case for BGC

Many floats report hundreds of profiles and the erddap may return a Error 413 (Payload Too Large)

See for instance float 6901180 with +400 profiles:

DataFetcher(ds='bgc').float(6901180)

This new feature should take place in https://github.com/euroargodev/argopy/blob/master/argopy/utils/chunking.py

[github-actions]

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