[ENH] Add n_timepoints in the metadata stored by BaseSeriesEstimator #2769
Description
Describe the feature or idea you want to propose
Unless mistaken, we currently don't store n_timepoints information in the metadata of BaseSeriesEstimator.
Describe your proposed solution
Axis dependent inside the function
aeon/aeon/base/_base_series.py
Line 102 in f5380f0
timepoint_idx = 1 if self.axis == 1 else 0
self.metadata["n_timepoints"] = X.shape[timepoint_idx]
Describe alternatives you've considered, if relevant
No response
Additional context
No response