[ENH] FreshPRINCERegressor, RotationForestRegressor and minor changes to FreshPRINCEClassifier

[dguijo]

Reference Issues/PRs

None

What does this implement/fix? Explain your changes.

• Modifies the names of FreshPRINCE and RotationForest classifiers to FreshPRINCEClassifier and RotationForestClassifier.
• Adds the RotationForestRegressor.
• Adds the FreshPRINCERegressor.
• Modifies some of the previous tests for time series regression.
• Adds the smallest multivariate dataset (CardanoSentiment).
• Modifies the load of the Covid3Month dataset.

Does your contribution introduce a new dependency? If yes, which one?

It doesn't.

What should a reviewer concentrate their feedback on?

• [] Check that I've modified all old references to FreshPRINCE and RotationForest.
• [] Check that the tests added for the FreshPRINCEClassifier and FreshPRINCERegressor are correct.
• [] Check that functions written for loading new TSER datasets are correct.

Did you add any tests for the change?

Yes, for FreshPRINCEClassifier and FreshPRINCERegressor.

PR checklist

For all contributions

• I've added myself to the list of contributors.
• Optionally, I've updated aeon's CODEOWNERS to receive notifications about future changes to these files.
• The PR title starts with either [ENH], [MNT], [DOC], or [BUG] indicating whether the PR topic is related to enhancement, maintenance, documentation, or bug.
• [] For new estimators, I've added the estimator to the online documentation.

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[MatthewMiddlehurst]

Nice contributions David, thanks!

Only a couple of things I think should be changed.

[TonyBagnall]

great