Move annotation CRUD actions into a service

[jon-betts]

Currently our annotation actions are spread over a few places, most notably h.storage. This predated our use of services, and as a result is a bit weird when you come across it.

Tasks

• Spikey: Storage as service #7926
• Move fetch_ordered_annotations into a new annotation service #7927
• Move URLMigrationService annotation queries to annotations service #7929
• Move update_annotation to the annotation service #7930
• Move create_annotation to the annotation service #7931
• Move fetch_annotation to the annotation service #7933
• Try out separate annotation read and write services #7946 (spike)
• Replace storage.fetch_annotation with an AnnotationReadService #7947
• Replace storage.fetch_ordered_annotation with an AnnotationReadService method #7948
• Replace storage.create_annotation with an AnnotationWriteService #7966
• Replace storage.update_annotation with an AnnotationWriteService method #7967
• Look at rename user which has find anno functionality