Tempo: Basic PoC of the upcoming TraceQL editor in Explore (#54028)

* First working version of the TraceQL editor with syntax highlighting and autocomplete

* Add feature flag around the new editor option

* Fix tests and cleanup

* Fix misspelling

packages/grafana-data/src/types/featureToggles.gen.ts

@@ -63,4 +63,5 @@ export interface FeatureToggles {
   internationalization?: boolean;
   topnav?: boolean;
   customBranding?: boolean;
+  traceqlEditor?: boolean;
 }