Add stencil variants of USkate World config

Add 5-point, 9-point, and 25-point stencil variants of USkate world

# 5-point stencil
[[0, 1, 0], \
[1, -4, 1], \
[0, 1, 0]]

# 9-point stencil
[[1, 2, 1], \
[2, -12, 2], \
[1, 2, 1]]

# 25-point stencial
[[0, -1, -1, -1, 0], \
[-1, 2, 10, 2, -1], \
[-1, 10, -36, 10, -1], \
[-1, 2, 10, 2,- 1], \
[0, -1, -1, -1, 0]]

Also, it turns out that the Laplacian of Gaussian version of U-Skate is also missing (never added to git tracking). Please add the LoG U-Skate config as well.

# LoG approximates ∇² by convolving an image with LoG kernel, the Laplacian of the Gaussian. 
# this approach allows kernels to be scaled.

laplacian_of_gaussian = 1 / (pi * sigma**4) * (1 - (r**2 / (2*sigma**2)) * exp(- (r**2 / (2*sigma**2)) 

Locate the tracked USkate world configuration and review how existing stencil variants are represented. Add the 5-point, 9-point, 25-point, and Laplacian-of-Gaussian configurations described in the issue, then verify that all four are included in the project’s normal configuration or loading path. The LoG expression is incomplete, so confirm its intended form before considering the work done.