Merge pull request #25509 from savuor:rv/hal_otsu

HAL added for Otsu threshold #25509

fixes #25393

### Pull Request Readiness Checklist

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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
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
- [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake

modules/imgproc/src/hal_replacement.hpp

@@ -856,6 +856,25 @@ inline int hal_ni_threshold(const uchar* src_data, size_t src_step, uchar* dst_d
 #define cv_hal_threshold hal_ni_threshold
 //! @endcond
 
+/**
+   @brief Performs threshold filtering using threshold estimated by Otsu algorithm
+   @param src_data Source image data
+   @param src_step Source image step
+   @param dst_data Destination image data
+   @param dst_step Destination image step
+   @param width Source image width
+   @param height Source image height
+   @param depth Depths of source and destination image
+   @param maxValue Value assigned to the pixels for which the condition is satisfied
+   @param thresholdType Thresholding type
+   @param thresh Calculated threshold value
+*/
+inline int hal_ni_threshold_otsu(const uchar* src_data, size_t src_step, uchar* dst_data, size_t dst_step, int width, int height, int depth, double maxValue, int thresholdType, double* thresh) { return CV_HAL_ERROR_NOT_IMPLEMENTED; }
+
+//! @cond IGNORED
+#define cv_hal_threshold_otsu hal_ni_threshold_otsu
+//! @endcond
+
 /**
    @brief Calculate box filter
    @param src_data Source image data