AnnotationTileLayer vends its own name

[1ec5]

Fixes #5159.

@jfirebaugh, any idea why no features are returned in the test? When I put this fix into my branch in #5110, annotation features are returned by queryRenderedFeatures().

[jfirebaugh]

My guess is that it's because the map isn't rendered before calling queryRenderedFeatures, and AnnotationManager has some behavior, largely leftover from pre-main-thread-Map days, where it doesn't actually modify the style until the map is rendered.

[1ec5]

Adding an annotation does kick off an asynchronous update, but I guess this headless map would need a synchronous update. I added a test::render() call to kick it off. I think that’s reasonable for this particular test, since it’s query rendered features and the other annotation tests all render too.