[ENH] Correct broken source links for set_params and get_params in Aeon estimator docs

[Kaustbh]

Reference Issues/PRs

Fixes: #2752

What does this implement/fix? Explain your changes.

This PR fixes broken "Source" links in the Aeon documentation for the set_params and get_params methods.
Currently, the autogenerated links incorrectly point to sklearn paths such as:

"https://github.com/aeon-toolkit/aeon/blob/main/sklearn/base.py#L255-L297"
which leads to a 404 error, since these methods are inherited from sklearn.BaseEstimator and not directly implemented in Aeon code.

Solution: Added set_params and get_params methods in aeon/base/_base.py where the users will be directed from the documentation, which are actually implemented in sklearn.

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

Any other comments?

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