Extend `CurationModel` to `SequentialCuration`

[alejoe91]

We can extend the apply_curation to a list of curation steps:

class SequentialCuration(BaseModel):
    curation_steps: List[CurationModel]

• some validators!!!

Then the apply_curation will be as follows:

def apply_curation(analyzer, curation_or_sequential_curation):
    if isinstance(curation_or_sequential_curation, CurationModel):
        return apply_one_step_curation(analyzer)
    elif isinstance(curation_or_sequential_curation, SequentialCuration):
        analyzer_current = analyzer
        for curation_step in curation_or_sequential_curation.curation_step:
            analyzer_current = apply_one_step_curation(analyzer_current)
        return analyzer_current

The SecuentialCuration will also have a method to generate an (n_spikes, n_steps) matrix representation of the curation steps.