* Override the default gather method to support scalars
* add computing average of a list
* bug: change if to elif
* add some tests
* change style
* change documentation
* use apply_to_collection in DP gather
* use apply_to_collection in DP gather
* fix warning msg
* override gather method in DP
* add tests for python scalars
* add python scalars to docstring
* Update message
* override gather method in DP
* formatting
* chlog
Co-authored-by: Jirka Borovec <Borda@users.noreply.github.com>
Co-authored-by: Jirka Borovec <jirka@pytorchlightning.ai>
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