Blur a patch and return a patch of the same size

[KurbyDoo]

Background

While the mock models and elevation encoding are still being implemented, we will mock the pipeline behaviour by defining a simple blur function that can operate on inputs.

Description

• Create the interface for users to call this model pipeline, some entrypoint such as ModelPipeline.generate(patch)
• Define a second function called blur that takes in a grid of numbers and blurs them by changing the value of each cell to be the average of cells around it
• Within the interface call the blur function on the input patch and return the modified grid.