[ENH] Add STOMP anomaly detector.

[wenig]

Reference Issues/PRs

Fixes #1638

What does this implement/fix? Explain your changes.

Adds the STOMP algorithm for anomaly detection.

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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: [ $\color{#6F6E8D}{\textsf{anomaly detection}}$ ]. Feel free to change these if they do not properly represent the PR.

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[SebastianSchmidl]

@wenig thank you for the support! I'll check with the team regarding the failing tests.

[MatthewMiddlehurst]

Thanks for the contribution, looks good!