Import ABC from collections.abc to remove deprecation warnings

Importing ABC from collections module directly is deprecated since 3.4 and is removed in Python 3.9. Thus this will cause ImportError for pyspark in Python 3.9 in the resultiterable module where Iterable is used from collections at https://github.com/tirkarthi/spark/blob/aa9da9365ff31948e42ab4c6dcc6cb4cec5fd852/python/pyspark/resultiterable.py#L23.

Relevant CPython PR : https://github.com/python/cpython/pull/10596.

I am a new contributor and would like to work on this issue.

Thanks