Handle PyTorch to Flax conversion of 1D convolutions
# What does this PR do?

Currently, only 2-dimensional convolutional layers are renamed and reshaped in the PyTorch to Flax conversion script. This PR handles the case of 1-dimensional convolutions layers, in an entirely equivalent way to their 2-dimensional counterparts.
_The documentation is not available anymore as the PR was closed or merged._<|||||>I'm a bit surprised that we needed that. We already had 1D Conv layers in Flax in Wav2Vec2 and the conversion worked 