[ENH] Type hints for primitives and string arguments:Part3

[nileenagp]

Reference Issues/PRs Part of https://github.com/aeon-toolkit/aeon/issues/1454

What does this implement/fix? Explain your changes. Adding type hints to remaining scripts in : aeon/classification/sklearn/_continuous_interval_tree.py ( Existing class _TreeNode, has been moved above ContinuousIntervalTree, in order to include the type[_TreeNode] in the type hints)

aeon/classification/shapelet_based scripts.

Does your contribution introduce a new dependency? If yes, which one? None

Any other comments? Type hints are NOT added in other methods since they were not primitive types.

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I have added the following labels to this PR based on the title: [ $\color{#FEF1BE}{\textsf{enhancement}}$ ]. I have added the following labels to this PR based on the changes made: [ $\color{#BCAE15}{\textsf{classification}}$ ]. Feel free to change these if they do not properly represent the PR.

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