Support multi-category filtering of results

[ohltyler]

Description

This PR adds support for filtering results on a subset of categorical fields. For example, if a user has 2 categorical fields selected, they can now search for the top values of one field, ignoring the other. And, when selecting a value of one of these fields, a sorted list of the top values of the other field is displayed for viewing on the anomaly and feature charts. This is supported for both real-time and historical scenarios.

The primary changes in this PR include:

• Adding support for new multi-category filtering API (see backend PR)
• Adding a combo box filter at the top of the charts to select some subset of categorical fields, rather than a hardcoded string that includes all of the fields.
• Adding a combo box filter when a heatmap cell is selected, to select multiple values to display on the charts.
• Adding support for multiple time series on the anomaly charts and feature charts.
• Moving anomaly filtering / sorting logic from the child components into the base container (AnomalyHistory), making them more stateless as components should be.
• Minor changes to the entity list format in the heatmap cell. Changed from Entities: <entity-value-1>, <entity-value-2> => Entities: <entity-name-1>: <entity-value1>, <entity-name-2>: <entity-value-2>. The main reason for this change is so the full entity information can be passed to the child components when needed - before, only the values were being passed.
• Fixing bucketized results - previous code had a bug where bucketized results weren't being retrieved properly. That has been fixed here, which also meant more logic needed to be added to handle zooming from bucketized results => non-bucketized results.
• Misc. other cleanup (fixed stale data occasionally showing up on feature and details charts, fixed sample anomaly zoom state bug, separated logic of sample vs. non-sample data in heatmap chart, added comments for existing vars or methods that weren't clear, renamed many vars and methods to make them more clear)

Testing:

• All UT pass
• All IT pass
• Confirmed it is consistent for real-time and historical
• Confirmed nothing breaks on non-high-cardinality & high-cardinality-single-category detector results
• Confirmed nothing breaks on sample anomalies via preview

Screenshots:

New combo box filter for categorical fields:

New combo box filter for child categorical field values (when a heatmap cell is selected):

Multi-time-series support, with consistent coloring for anomaly & feature results:

Check List

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