Datadog logscale addition

Does a few things:

1. Updates the in-code documentation substantially.
2. Adds a transformation for the anomaly scores so they match the bar heights in the mobile application.
3. Adds a hack to limit the number of records sent to Datadog to what the user specifies. This is to remedy a bug in Grok version prior to 1.3 that don't respect the `limit` parameter in model data API requests for a single model.