Annotations: Add to data frame with usable overrides

**Why is this needed**: Annotation data can be derived from standard queries, but it is currently not possible to add them to a visualization this way. Enabling this will allow people to bring in annotations from anywhere, and build better dashboards to display more data. Decide on a method to make this possible. **Option 1:** Add options for query types via the standard query editor in dashboard edits. Allow users to select between adding queries as a "Series", "Annotations" or "Exemplars" type. It should default to "Series". Adding a new option in the query editor should be coordinated with the dashboards team. **Option 2:** Add a transformation called "Convert Frame" and have options to convert a query result to annotations or exemplar data. This is less drastic of a code change, but is less future forward. With this data available, we should ensure that we have a method to toggle it from the legend. The standard way will not work if we add annotation data directly to the frame, as there will be duplicate field names between sets of annotations and toggling as it is now requires unique field names. Once this works, look into the following and decide if its trivial to add now or break into other issues. - Legend toggling (this was mixed in with other legend work, in https://github.com/grafana/grafana/pull/111880 . Actual implementation of the legend should be accomplished with https://github.com/grafana/grafana/issues/112684) - Add override options https://github.com/grafana/grafana/pull/111905 https://github.com/grafana/grafana/pull/111782 - New options https://github.com/grafana/grafana/pull/111837 https://github.com/grafana/grafana/pull/111851 https://github.com/grafana/grafana/pull/112183 https://github.com/grafana/grafana/pull/112226 This feature is the result of a hackathon. Please review preliminary work. The following PR explores the method of adding it via the "Convert frame" transformation https://github.com/grafana/grafana/pull/109758 with additiona…