Moved all implementations of n queens into one file

[Mallik0]

Describe your change:

This PR moves all implementations of n queens concepts into one file named all_n_queens.py, which includes n_queens.py, n_queens_math.py, and sudoku.py which are all the implementations of n queens concept moved into one single file

Fixes #8098

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 include at least one URL that points to Wikipedia or another similar explanation.
• If this pull request resolves one or more open issues then the description above includes the issue number(s) with a closing keyword: "Fixes #ISSUE-NUMBER".

[tianyizheng02]

Please organize and clean up the implementations rather than simply copy-pasting them into the one file one after the other.

[tianyizheng02]

I feel that sudoku is a distinct enough problem that it shouldn't be lumped with the other n-queens implementations.