feat : added nansum function for Pytorch frontend

[chaitanya710]

PR Description

sub_task of Add Reduction ops to PyTorch Frontend #13

Related Issue

Close #23197

Checklist

• Did you add a function?
• Did you add the tests?
• Did you follow the steps we provided?

[github-actions]

Thanks for contributing to Ivy! 😊👏
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1. Feel free to ignore the run_tests (1), run_tests (2), … jobs, and only look at the display_test_results job. 👀 It contains the following two sections:
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- New Failures Introduced: This lists the tests that are passing on main, but fail on the PR Fork. Please try to make sure that there are no such tests. 💪
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[ivy-leaves]

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Thank you 🤗

[chaitanya710]

If you are working on an open task, please edit the PR description to link to the issue you've created.

For more information, please check ToDo List Issues Guide.

Thank you 🤗

Done

[juliagsy]

Hey there! Thanks for the great work!
Could you please remove all changes in the .idea folder? and also one small addition to the test in the comment below, thanks a lot!

[chaitanya710]

Hey there! Thanks for the great work! Could you please remove all changes in the .idea folder? and also one small addition to the test in the comment below, thanks a lot!

Done

[github-actions]

PR Compliance Checks

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Conventional Commit PR Title

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Linting Errors

• Found type "null", must be one of "feat","fix","docs","style","refactor","perf","test","build","ci","chore","revert"
• No subject found

[juliagsy]

Thanks for contributing!