Implement a thresholded random cut forest runner

[cswiercz]

A thresholded random cut forest runner is similar to the anomaly score runners of the core package. In addition to showing the anomaly score associated with a given input point, this new runner outputs the anomaly grade.

Issue #, if available:

n/a

Description of changes:

• Add a ThresholdedRandomCutForestRunner class. Similar to AnomalyScoreRunner and others.
• Add a ThresholdedArgumentParser class for allowing configuration of thresholder hyperparameters.
• Provide usage example (and external test) in a package-level README.
• Edited parkservices's pom file to allow compilation to a single jar file with dependencies.

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[sudiptoguha]

Is there a reason to review when checks have failed. Also ThresholdedRunner s undergoing a refactoring. This runner is inappropriate at this time.