* Add support for exemplars
* TraceQL metrics exemplars ftw
* Fix exemplars on histogram queries
* Added exemplars field for the query builder options
* Add series labels as exemplars dataframe fields so the panel can link series with exemplars
* Fix tests
* Fix lint
* Hide exemplars field from options
* Fix crash on histogram queries
* Use DataTopicAnnotations enum
* Fix test
* Move TraceQL metrics queries to backend
* Add tests for TransformMetricsResponse
* Add tests for createMetricsQuery
* Refactor, detect metric queries and throw error for search queries
* Remove unneeded types
* Don't add start and end if they are 0. Return on err
* lint
* Fix pre-alloc of frames
* Address PR comments