Created max_sum_sliding_window in Python/other

[Kush1101]

Describe your change:

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Documentation change?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new Python files are placed inside an existing directory.
• All filenames are in all lowercase characters with no spaces or dashes.
• All functions and variable names follow Python naming conventions.
• All function parameters and return values are annotated with Python type hints.
• All functions have doctests that pass the automated testing.
• All new algorithms have a URL in its comments that points to Wikipedia or other similar explanation.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[Kush1101]

@dhruvmanila @shellhub, Please review it.

[dhruvmanila]

I might be wrong but it seems that this is an incorrect algorithm.

As far as I understand you are finding the maximum value from the sum of k consecutive integers in a list of integers which means:

>>> arr = [1, 4, 2, 10, 2, 13, 1, 0, 2]
>>> k = 4
>>> max_sum(arr, k)  # This should give me 27
16

Your algorithm provides 16 as the answer but the answer clearly is 27. Your algorithm is just giving the sum of the last k integers. If so, please test your algorithm thoroughly before submitting. Use black box and white box testing, random tests and especially test the edge cases.

[Kush1101]

There was a bug in the program. I corrected it and added more tests. Now the algorithm works just the way it should.

[dhruvmanila]

Also, can you take a look at #3094 ?
Thanks.