Merge pull request #29428 from Akansha-977:filter2D_IPP_migration

Filter2D IPP extraction to HAL for 5.x #29428

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [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

hal/ipp/include/ipp_hal_imgproc.hpp

@@ -10,6 +10,10 @@
 
 // Disabled in https://github.com/opencv/opencv/pull/13085 due large binary size
 #define DISABLE_IPP_BOX_FILTER 1
+// IPP filter2D integration is disabled in main OpenCV; kept behind a macro like box filter.
+#define DISABLE_IPP_FILTER2D 1
+// Too big difference compared to OpenCV FFT-based convolution, different results on masks > 7x7
+#define IPP_DISABLE_FILTER2D_BIG_MASK 1
 
 #if IPP_VERSION_X100 >= 810
 
@@ -50,6 +54,19 @@ int ipp_hal_boxFilter(const uchar* src_data, size_t src_step, uchar* dst_data, s
 #define cv_hal_boxFilter ipp_hal_boxFilter
 #endif // defined(HAVE_IPP_IW) && !DISABLE_IPP_BOX_FILTER
 
+#if defined(HAVE_IPP_IW) && !DISABLE_IPP_FILTER2D
+int ipp_hal_filter2D(const uchar * src_data, size_t src_step, int src_type,
+                     uchar * dst_data, size_t dst_step, int dst_type,
+                     int width, int height, int full_width, int full_height,
+                     int offset_x, int offset_y,
+                     const uchar * kernel_data, size_t kernel_step, int kernel_type,
+                     int kernel_width, int kernel_height,
+                     int anchor_x, int anchor_y, double delta, int borderType,
+                     bool isSubmatrix, bool allowInplace);
+#undef cv_hal_filter_stateless
+#define cv_hal_filter_stateless ipp_hal_filter2D
+#endif // defined(HAVE_IPP_IW) && !DISABLE_IPP_FILTER2D
+
 #endif //IPP_VERSION_X100 >= 810
 
 #if IPP_VERSION_X100 >= 700