DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3, and in 3.9 it will stop working

[devin-petersohn]

Since we already have people using Python 3.9, we should change this.

modin\pandas\iterator.py:16

[tirkarthi]

I have created #2641 to fix this. I have also fixed some deprecation warnings.

[tirkarthi]

The change was delayed to Python 3.10 which will raise ImportError for importing ABC directly from collections.