conv2d should check if dilation > 0

[Quba1]

Feature description

tensor::module::conv2d() should check if dilation is greater than 0.

I haven't checked, but conv1d and conv3d also should have that check included.

Feature motivation

Mathematically convolution with dilation (0,0) doesn't really make sense. The implementation in backends can handle dilation (0,0) without error, but the output is nonsensical.

(Optional) Suggest a Solution

Presumably a simple if () {panic!()} will work.