feat: added to_grayscale paddle function

[Younggregs]

PR Description

feat: added to_grayscale paddle function

Related Issue

Closes #26822

Checklist

• Did you add a function?
• Did you add the tests?
• Did you run your tests and are your tests passing?
• Did pre-commit not fail on any check?
• Did you follow the steps we provided?

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[hmahmood24]

Hey @Younggregs, thanks a lot for the PR. However, the tests running locally are failing and we'd need to fix them before merging the PR. Did you not run your tests locally using pytest?

[hmahmood24]

Closing this PR since it has been stale for more than 2 weeks now.