Feature Request: Implement more anomaly detection models

[meghdadFar]

Feature Request: Implement more anomaly detection models

Description:

Currently, only one anomaly detection model i.e. NormalDistAnomalies is implemented.
This model is limited in the sense that:

1. It only accepts items with a one-dimensional feature representation (e.g. frequency).
2. If the distribution of this one-dimensional feature cannot be Gaussanized, the model does not work.

The goal is to implement more anomaly detection models to address both of the above issues.

Possible Implementation (optional):

TBD