Explore: Generic query import/export (#40987)

* Add basic implementation

* Split import/export query interface

* Rename abstract query type

* Rename abstract query type

* Split loki/prom parsing

* Update docs

* Test importing abstract queries to Elastic

* Test exporting abstract queries from Graphite

* Test Prom and Loki query import/export

* Give better control to import/export all queries to data sources

* Fix unit test

* Fix unit test

* Filter out non-existing labels when importing queries to Loki

* Fix relative imports, names and docs

* Fix import type

* Move toPromLike query to Prometheus code

* Dedup label operator mappings

* importAbstractQueries -> importFromAbstractQueries

* Fix unit tests

public/app/features/explore/state/query.ts

@@ -7,6 +7,8 @@ import {
   DataQueryResponse,
   DataSourceApi,
   hasLogsVolumeSupport,
+  hasQueryExportSupport,
+  hasQueryImportSupport,
   HistoryItem,
   LoadingState,
   PanelData,
@@ -265,6 +267,9 @@ export const importQueries = (
     if (sourceDataSource.meta?.id === targetDataSource.meta?.id) {
       // Keep same queries if same type of datasource, but delete datasource query property to prevent mismatch of new and old data source instance
       importedQueries = queries.map(({ datasource, ...query }) => query);
+    } else if (hasQueryExportSupport(sourceDataSource) && hasQueryImportSupport(targetDataSource)) {
+      const abstractQueries = await sourceDataSource.exportToAbstractQueries(queries);
+      importedQueries = await targetDataSource.importFromAbstractQueries(abstractQueries);
     } else if (targetDataSource.importQueries) {
       // Datasource-specific importers
       importedQueries = await targetDataSource.importQueries(queries, sourceDataSource);