add feature to oversample projection parameters

[deepchatterjeeligo]

After this patch, the waveform generator will have the ability to oversample dec, phi, psi by a factor >= 1, so that the effective batch size is batch_size * oversampling_factor.

[deepchatterjeeligo]

125 to be considered first.

[ravioli1369]

I feel the effective batch_size = batch_size * oversampling_factor should be made a bit clearer in the config, maybe oversampling_factor can be a param just right below batch_size, with a comment that explains it, or the batch_size can stay the same, and internally batch_size//oversampling_factor waveforms would be generated, then oversampled (this also should include a comment next to batch_size)