feat(core): add a new selector named getFeature to the ConfigState

resolves #4812

npm/ng-packs/packages/core/src/lib/services/config-state.service.ts

@@ -29,6 +29,10 @@ export class ConfigStateService {
     return this.store.selectSnapshot(ConfigState.getApiUrl(...args));
   }
 
+  getFeature(...args: Parameters<typeof ConfigState.getFeature>) {
+    return this.store.selectSnapshot(ConfigState.getFeature(...args));
+  }
+
   getSetting(...args: Parameters<typeof ConfigState.getSetting>) {
     return this.store.selectSnapshot(ConfigState.getSetting(...args));
   }

npm/ng-packs/packages/core/src/lib/states/config.state.ts

@@ -65,6 +65,14 @@ export class ConfigState {
     return selector;
   }
 
+  static getFeature(key: string) {
+    const selector = createSelector([ConfigState], (state: Config.State) => {
+      return snq(() => state.features.values[key]);
+    });
+
+    return selector;
+  }
+
   static getSetting(key: string) {
     const selector = createSelector([ConfigState], (state: Config.State) => {
       return snq(() => state.setting.values[key]);