fix: Added type hint for start and end datetime for interval

[inzamol]

Added type hint for start and end datetime for interval

Pull Request Checklist

Thank you for taking the time to improve Arrow! Before submitting your pull request, please check all appropriate boxes:

• [ ✓] 🧪 Added tests for changed code.
• [✓ ] 🛠️ All tests pass when run locally (run tox or make test to find out!).
• [✓ ] 🧹 All linting checks pass when run locally (run tox -e lint or make lint to find out!).
• [ ✓] 📚 Updated documentation for changed code.
• [ ✓] ⏩ Code is up-to-date with the master branch.

If you have any questions about your code changes or any of the points above, please submit your questions along with the pull request and we will try our best to help!

Description of Changes

This PR will fix issue "Closes: #1210", which is a bug related to type hint

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (b423717) to head (a070f5c).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #1230   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines         2315      2315           
  Branches       358       358           
=========================================
  Hits          2315      2315           

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[inzamol]

@krisfremen , Can you please complete the review

[jadchaar]

Had one comment - thanks for your contribution

[jadchaar]

Hi @inzamrzn918 mind adding a unit test? Then we can close this out.