feat(image): image smoothing for stack/volume viewports (#2353)

* feat(image):Added image smoothing functionality for stack/volume viewport

* feat(image): image smoothing for stack/volume viewports

* Changed range of sharpening

* ensure smoothing is active only when smoothing property of viewport greater than 0

* Added type for kernel

* Updated comment

* Formatted the code

Author: suryadas-trenser