[Audio] Add Conv1D layer

[zaleslaw]

We are missing some layers to support the export of models from Keras fully. One of them is the Conv1D layer.

Add a layer class, write documentation for it, write a test for it, try, if possible, create a small trainable network with it (in your own GitHub) and attach a link here in the comments.

The layer should be placed here

As a reference implementation, the Conv2D layer could be used, but feel free to improve it!

If some refactoring to convolutional layers could be applied, please, try to do it!

Also, support for export and import of layer in JSON format should be added (see ModelLoader.kt and ModelSaver.kt)

A detailed description of the layer can be found here

P.S. There are no-ops for tf.nn.conv1d in Java API, so you could try to implement it from scratch via available ops or use tf.nn.conv2d like in TensorFlowJS with reshape in tfjs-core/src/ops/conv1d.ts

[avan1235]

I can start working on it on my repository fork and try to open PR in a few days

[zaleslaw]

Great, @avan1235 I could assign the ticket if you are in the comments thread