Anomaly detection Nodes

[luiztauffer]

Description

• I've included a concise description of what each node does

Styleguide

• My node adheres to the styleguide for Flojoy nodes

Docs

• I've submitted a PR for a documentation page for the new node(s) that contains usage examples (see docs.flojoy.io)

Testing

• This PR includes a unit test (example here and/or ideally a screenshot of the node's output on an example app.

Features

• AI / ANOMALY_DETECTION / ISOLATION_FOREST Node - uses the Isolation Forest algorithm to detect anomalous points in a tabular dataset.
• GENERATORS / SAMPLE_DATASETS / TABULAR_DATASETS - Generates tabular datasets from sklearn datasets