[ENH] Add DL anomaly detection algorithms: Telemanom

[SebastianSchmidl]

Describe the feature or idea you want to propose

Add Telemanom deep learning anomaly detector. Reference: https://doi.org/10.1145/3219819.3219845

Telemanom comes with an automatic threshold strategy that might not be applicable to other anomaly detectors. We need to decide how to deal with this part of the algorithm: Should Telemanom return the anomaly scores or the binary predictions after thresholding?

Describe your proposed solution

• TimeEval implementation: https://github.com/TimeEval/TimeEval-algorithms/tree/main/telemanom
• Source implementation: https://github.com/khundman/telemanom

Describe alternatives you've considered, if relevant

No response

Additional context

No response