DataSourceAPI: Expose new method for filter applicability check (#106756)

* wip

* wip non applicalbe filters

* refactor getApplicableFilter to return a string[]

* remove getApplicableFilters impl from prometheus

packages/grafana-data/src/types/datasource.ts

@@ -306,6 +306,11 @@ abstract class DataSourceApi<
    */
   metricFindQuery?(query: any, options?: LegacyMetricFindQueryOptions): Promise<MetricFindValue[]>;
 
+  /**
+   * Verify adhoc filters applicability based on queries and current filters
+   */
+  getApplicableFilters?(options?: DataSourceGetTagKeysOptions<TQuery>): Promise<string[]>;
+
   /**
    * Get tag keys for adhoc filters
    */