* prepare backend for structured metadata
* add `lokiStructuredMetadata` feature toggle
* use `lokiStructuredMetadata` feature flag
* add field type check to `labelTypesField`
* remove fixme
* fix feature toggle
* add field in dataplane mode
* use `data.Labels` where possible
* adjust framing tests
* improve verbiage
* improve naming
* update tests to "attributes"
* Logs: Fix duplicate uids by appending series refIds
* Fix id generation in loki live streams to be consistent
* Update public/app/core/logsModel.ts
Co-authored-by: Sven Grossmann <sven.grossmann@grafana.com>
* Fix test
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Co-authored-by: Sven Grossmann <sven.grossmann@grafana.com>
