[DOC] Improve visualization module documentation

[Kaustbh]

Reference Issues/PRs

Fixes: #2580

What does this implement/fix? Explain your changes.

This PR addresses the following improvements in the Aeon documentation:

Adding New Notebooks:

• Introduces notebooks for the distances and estimator modules.

Fixing Duplication:

• Modifies examples.md to correctly render the plotting_for_learning_tasks notebook.

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

Any other comments?

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[MatthewMiddlehurst]

Hi are there any issues with this? It is still a draft.

[Kaustbh]

There is a little change in examples.md I want to do, and additionally I am thinking of adding a notebook for estimator module.

[Kaustbh]

Hi, @MatthewMiddlehurst I have made the changes, you can review it now.