REFACTOR: Add mypy checks for modin.core.dataframe.algebra

[yashgosa]

What do these changes do?

• first commit message and PR title follow format outlined here

  NOTE: If you edit the PR title to match this format, you need to add another commit (even if it's empty) or amend your last commit for the CI job that checks the PR title to pick up the new PR title.

• passes flake8 modin/ asv_bench/benchmarks scripts/doc_checker.py
• passes black --check modin/ asv_bench/benchmarks scripts/doc_checker.py
• signed commit with git commit -s
• Resolves #?
• tests added and passing
• module layout described at docs/development/architecture.rst is up-to-date

[yashgosa]

@pyrito @mvashishtha guys I aint able to understand why is this error occurring

modin\core\dataframe\algebra\groupby.py:74:40: error: "caller" of "GroupByReduce" gets multiple values for keyword argument "query_compiler"  [misc]
modin\core\dataframe\algebra\groupby.py:74:40: error: "caller" of "GroupByReduce" gets multiple values for keyword argument "by"  [misc]
modin\core\dataframe\algebra\groupby.py:74:40: error: "caller" of "GroupByReduce" gets multiple values for keyword argument "map_func"  [misc]
modin\core\dataframe\algebra\groupby.py:74:40: error: "caller" of "GroupByReduce" gets multiple values for keyword argument "reduce_func"  [misc]
modin\core\dataframe\algebra\groupby.py:74:40: error: "caller" of "GroupByReduce" gets multiple values for keyword argument "axis"  [misc]
modin\core\dataframe\algebra\groupby.py:74:40: error: "caller" of "GroupByReduce" gets multiple values for keyword argument "groupby_kwargs"  [misc]
modin\core\dataframe\algebra\groupby.py:74:40: error: "caller" of "GroupByReduce" gets multiple values for keyword argument "agg_args"  [misc]
modin\core\dataframe\algebra\groupby.py:74:40: error: "caller" of "GroupByReduce" gets multiple values for keyword argument "agg_kwargs"  [misc]
modin\core\dataframe\algebra\groupby.py:74:40: error: "caller" of "GroupByReduce" gets multiple values for keyword argument "drop"  [misc]
modin\core\dataframe\algebra\groupby.py:74:40: error: "caller" of "GroupByReduce" gets multiple values for keyword argument "method"  [misc]
modin\core\dataframe\algebra\groupby.py:74:40: error: "caller" of "GroupByReduce" gets multiple values for keyword argument "default_to_pandas_func"  [misc]

[lgtm-com]

This pull request introduces 1 alert when merging 797a888 into 6f0ff79 - view on LGTM.com

new alerts:

• 1 for Unused import

[yashgosa]

This pull request introduces 1 alert when merging 797a888 into 6f0ff79 - view on LGTM.com

new alerts:

• 1 for Unused import

@pyrito can you please help me out

[yashgosa]

@mvashishtha can you please review the code now I don't think so there should be any issues, if there are some changes required do tell me

[mvashishtha]

@sofezticated-gentleman I still see quite a lot of formatting changes, e.g. in modin/_compat/pandas_api/py36/base.py. Could you please revert all those and push to your branch again?