Add waveform extractor after spike sorting

[oliche]

We use CAR and save the noise model. (unsure about time LC filter)

• 256 waveforms
• 40 channels
• 128 samples
• float 16

In the form of a 4D array (nu, nw, nc, ns)

Provide memmap loading option

The accompanying table will be multi-index (nu, nw).

NP2.4 Work at 200um radius

Display Trace view of peak channel with all stack order Corresponding amplitude spectra (padding with 0 so we have resolution)

Resycing: reference = median of waveforms compute time shift between all spikes and reference apply and compare

[oliche]

int-brain-lab/ibl-neuropixel/15ba1764a96035f47d95308ecc967ffff5c05ca3 passes the integration tests after a few modifications