Ibl-neuropixel

- spikeglx geometry chops the ADC sample shift to the number of channels to accomodate legacy 3A probes with 276 channels
- agc: gain refers to the inverse of applied gains for agc - done to handle dead channels in destriping

- neurodsp.utils.rises / falls: detects rising and falling edges of oversampled analog signals

- neuropixel: add functions to reconstruct original files from split NP2.4 files

minor changes
- support for returning number of shanks from metadata

- BUGFIX change getattr of `neuropixel` to allow for stared imports

- BUGFIX constant SYNC_PIN_OUT re-introduced in `ibl-neuropixel`

- destripe_decompress_cbin: add a parameter to output QC in a different location to accomodate pykilosort scratch dir
- support for NP2.4 and NP2.1 geometries on spikeGlx

minor changes
- deprecated SITES_COORDINATES that would default on Neuropixel 1.0 early generations (3A probes with 374 channels)
- spikeglx compress: pass dtype to mtscomp