ximgproc: Added SIMD Acceleration and Loop Unrolling for Domain Transform

[pratham-mcw]

This PR adds Universal Intrinsics-based SIMD optimization and loop unrolling for the Domain Transform Filter implementation in dtfilter_cpu.inl.hpp.

Key Optimizations:

• Added SIMD vectorization using OpenCV Universal Intrinsics.
• Added loop unrolling for recursive horizontal passes.
• Reduced redundant pointer calculatoins inside loops.

Performance Improvements

• I agree to contribute to the project under Apache 2 License.
• 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
• The PR is proposed to the proper branch