Add more dynamic inputs to DynamicConvOp

[gnecula]

Request description

Currently DynamicConvOp supports computed padding. We will also need computed window_strides, lhs_dilation and rhs_dilation.

I also notice that the op takes padding both as an input and as an attribute. JAX does not use the padding attribute, but I thought I'd point this out in case it is a mistake.

[gnecula]

I noticed that JAX's batching rules will end up making batch_group_count and feature_group_count dynamic if some of the input dimensions are dynamic. Hence, we need dynamic support for these also.