Use annotations to define description/filter/required filters of an InsightPoint

InsightPoint interface defined the getDescription method to define the human readable description of the Insight point.

To have better separation between the provided log/metrics/config information and the metadata, it would be better to use an annotation for this which also can include the filters (HDDS-2071).

Something like this:

@InsightPoint(description="Information from the async event queue of the SCM", supportedFilters=["eventType"],requiredFilters="")
public class EventQueueInsight extends BaseInsightPoint {

...

}