Add 1D MV-Convolution

[RobinKa]

Implements #8 (at least 1D convolution)

• Added geom_conv1d and keras layer GeometricProductConv1D
• Added convolution example notebook

Implemented using Winograd convolution which requires only a matmul implementation and a sliding window function. For the sliding window function extract_image_patches was used. This will also work for 2 dimensional convolution later. For 3 dimensions there is another function extract_volume_patches.