Adding resampling of data into one of the functions of deepcleanv2's utils

[agoodmanjerry]

In the preprocessing and postprocessing, we need to apply resample and bandpass on the strain and witness channels. Bandpass is already in the utils of deepcleanv2, but we are using gwpy to apply resampling now.
We may consider to add the resampling in the deepcleanv2's utils to keep the data processing consistent for training and online inferencing.

[mcoughlin]

@wbenoit26 I would guess this is ideally all in ML4GW already?

[wbenoit26]

torchaudio provides a resampling transform which is pretty easy to drop in