NameGrouper.datasets fails

Summary

{Summarize the bug encountered concisely}

I confirm that I have (if relevant):

• Read the troubleshooting guide: https://gitlab.com/aliby/aliby/-/wikis/Troubleshooting-(basic)
• Updated aliby and aliby-baby.
• Tried the unit test.
• Tried a scaled-down version of my experiment (distributed=0, filter=0, tps=10)
• Tried re-postprocessing.

Steps to reproduce

{How one can reproduce the issue - this is very important}

• aliby version: master commit SHA: 55cd055
• platform(s): Arran
• experiment ID: {918}

What is the current bug behavior?

Attribute error

What is the expected correct behavior?

It should originally return a list of datasets. The whole thing should be deprecated.

Logs/Traceback

AttributeError: 'Chainer' object has no attribute 'datasets'

Possible fixes

Remove the datasets method in all documentation.