HAL added for Otsu threshold

[savuor]

fixes #25393

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• [x] I agree to contribute to the project under Apache 2 License.
• [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
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• [x] There is a reference to the original bug report and related work
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[vpisarev]

BTW, the result of Otsu thresholding algorithm is black-n-white image. The input is grayscale image. It does not make sense to have cn parameter in this function