Changes to Query and filter usage data

the aggregations/items/fieldType/allOf[subschema #2] request property type changed from no type to object

the aggregations/items/function/allOf[subschema #2] request property type changed from no type to object

removed DataExplorerAccountGroup DataExplorerDimensionGroup DataExplorerTimeGroup from the groups/items request property oneOf list

added the new optional request property groups/items/groupType

the request property allOf[#/components/schemas/RequestWithStartAndEndDate]/endDate became optional

the request property allOf[#/components/schemas/RequestWithStartAndEndDate]/startDate became optional

added discriminator to groups/items request property

endpoint added