[ENH] GPFA with continuous data

[Moritz-Alexander-Kern]

This pull request extends the functionality of the GPFA classes methods to accept continuous data.

The changes are done to the methods fit, transform and fit_transform, which now accept continuous data.

Unit tests and docstrings have been written to ensure that the changes are properly implemented.

This PR seeks a continuation of the previously started development in PR #507.

The current input for continuous data to fit, transform and fit_transform is a numpy recarray

Todo

• [ ] decide on input type for continuous data
• [ ] integrate with trial object

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Co-authored-by: Jonah Pearl [email protected]