* Implement simple wrapper Op for `scipy.signal.convolve2d`

* Better shape inference

* conv2d gradient v0

* Implement Convolve2d and gradients

* Add same mode, and FFT support

* Relax test tolerance in float32

* Change seed

* Relax test tolerance in float32

* Add `convolve2d` to `signal.__init__`

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Co-authored-by: ricardoV94 <ricardo.vieira1994@gmail.com>