feat: add fftfreq() paddle frontend function in paddle.fft

[p1utoze]

PR Description

Add fftfreq() Paddle frontend function in paddle.fft

Related Issue

Resolves: #22948

Checklist

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

[github-actions]

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[p1utoze]

@D0m-inic Hi! Currently I have implemented fftfreq() function in paddle frontend but it haven't yet been implemented in the functional API. I have raised a suggestion issue #22992 for it. How should I proceed with this PR?

[p1utoze]

@D0m-inic Hi! All my test cases are passing. Can you review the code and merge it?

[p1utoze]

@KareemMAX Hey there! Can you review my PR? I have implemented the function and all the test cases are passing.

[KareemMAX]

Hey @p1utoze,
Great work 🚀, just a small comment that I want you to address then we are good to run the final tests and merge

[KareemMAX]

I think you need to check if it None or not before doing that

[p1utoze]

Hey! Sorry for the late response. I have added the dtype check.

[github-actions]

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Issue Reference

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[KareemMAX]

LGTM