[REF] Refactor Anomaly Detection Module into Submodules by Algorithm Family

[Kaustbh]

Reference Issues/PRs

Fixes: #2663

What does this implement/fix? Explain your changes.

This PR addresses the issue of organizing the anomaly_detection module by refactoring the estimators into submodules based on their algorithm families.

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

Any other comments?

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[Kaustbh]

In the follow-up commit, I make changes to the documentation and update all references where these algorithms are used.

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[SebastianSchmidl]

Looks promising, but some minor remarks inline.

I guess, the deep_learning module will probably host most of the reconstruction and forecasting approaches later. We might decide to split it up. But this decision is for later.

[SebastianSchmidl]

Just the open comment from last time; otherwise, this looks good 👍🏼

[TonyBagnall]

thanks for this, this module is still experimental so the refactor is fine.