ENH: python interface to model finder

[GavinHuttley]

This needs to take an alignment and other configuration commands. It will take a little work to sort this out the final design, but to start with it needs to return a custom dataclass which has properties such as aic_model which would return the model configuration selected using the AIC measure. The dataclass should also implement a _repr_html_() method and use the cogent3 table objects under the hood to get nice display in a jupyter notebook.