StyleDataLoaded

The style data has been loaded. The event will be emitted once for each `StyleDataLoadedType` type during style loading. If a new style is set, events will be emitted again for the newly set style. These events should not be used for runtime styling (using `RuntimeStylingOptions` is preferred), but only to check things like: loading time, loading progress of particular source, spritesheet, etc. Note: The event may be emitted synchronously, for example, when `setStyleJSON` is used to load style.