AlertingNG: POC of evaluator under feature flag. (#27922)

* New feature toggle for enabling alerting NG

* Initial commit

* Modify evaluate alert API request

* Check for unique labels in alert execution result dataframes

* Remove print statement

* Additional minor fixes/comments

* Fix lint issues

* Add API endpoint for evaluating panel queries

* Push missing renaming

* add refId for condition to API

* add refId for condition to API

* switch dashboard based eval to get method

* add from/to params to dashboard based eval

* add from/to params to  eval endpoint

Co-authored-by: kyle <kyle@grafana.com>

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

@@ -34,6 +34,7 @@ export interface BuildInfo {
 export interface FeatureToggles {
   live: boolean;
   expressions: boolean;
+  ngalert: boolean;
 
   /**
    * @remarks

packages/grafana-runtime/src/config.ts

@@ -57,6 +57,7 @@ export class GrafanaBootConfig implements GrafanaConfig {
     meta: false,
     datasourceInsights: false,
     reportGrid: false,
+    ngalert: false,
   };
   licenseInfo: LicenseInfo = {} as LicenseInfo;
   rendererAvailable = false;