[ENH] Type hints for primitives and string arguments:Part1

[nileenagp]

Reference Issues/PRs

Fixes #1454

What does this implement/fix? Explain your changes.

Adding type hints to 2 methods in the script: aeon.classification.distance_based._time_series_neighbors.
Methods are : init(), get_test_params()

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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[nileenagp]

All the checks are passed successfully. Please review.

[TonyBagnall]

LGTM, thanks for the PR

[MatthewMiddlehurst]

The current ones here do not match the docstring currently as well I'm pretty sure.

n_jobs could be Optional[int] (defaults to None)
distance and weights could be Union[str, Callable] (accepts functions)