Create file_utils.py

[MonarchChakri]

Utility file helpful for file I/O in python3.
Helps for plain text IO and JSON load and dump.

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.

[MonarchChakri]

Hi @cclauss / @poyea
Added file_utils.py under others and created this PR for #2510
A utility files helpful for all common file IO.
Please review and merge.

[MonarchChakri]

@cclauss
Will make the changes and update the file

[MonarchChakri]

@cclauss
Updated the file, please review

[MonarchChakri]

@poyea
Can you also please approve and merge. 😅

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