[ENH] Implemented IsolatedForest in anomaly detection with some test cases

[notaryanramani]

Reference Issues/PRs

Fixes #2108

What does this implement/fix? Explain your changes.

Implements PyODAdapter for IsolationForest in anomaly_detection along with some test cases.

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

No

Any other comments?

Looking for feedback on class documentation & more test cases if needed.

No.

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