get rid of hand-modified `allensdk`

[jnsbck]

A lot of modifications were made to the ephys_extractor.py and ephys_features.py from the AllenSDK. These modifications should be moved / integrated with features.py and added to the extractor via the add_sweep_feature function.

[jnsbck]

This was partially completed in the rewrite_object_oriented. However due to some bugs in the AllenSDK, this was not entirely succesful. To fix this a PR needs to be made to the AllenSDK.

[jnsbck]

For details of what changed see git diff main:ephyspy/allen_sdk/ephys_features.py 6691072:py_ephys/allen_sdk/ephys_features.py. Which is the diff between the original and modified AllenSDK