Add metadata store public api to fetch module metadata

- Make getMetatada method public
- Allow retrieving metadata for modules other that the current
-- Containers will need to display views of different modules

core/app/src/store/metadata/metadata.store.service.ts

@@ -156,19 +156,6 @@ export class MetadataStore implements StateStore {
         );
     }
 
-    /**
-     * Internal API
-     */
-
-    /**
-     * Update the state
-     *
-     * @param {object} state to set
-     */
-    protected updateState(state: Metadata): void {
-        this.store.next(internalState = state);
-    }
-
     /**
      * Get ListViewMeta cached Observable or call the backend
      *
@@ -176,7 +163,11 @@ export class MetadataStore implements StateStore {
      * @param {string[]} types to retrieve
      * @returns {object} Observable<any>
      */
-    protected getMetadata(module: string, types: string[]): Observable<Metadata> {
+    public getMetadata(module: string, types: string[] = null): Observable<Metadata> {
+
+        if (types === null) {
+            types = this.getMetadataTypes();
+        }
 
         let metadataCache: BehaviorSubject<Metadata> = null;
         // check for currently missing and
@@ -225,6 +216,19 @@ export class MetadataStore implements StateStore {
         );
     }
 
+    /**
+     * Internal API
+     */
+
+    /**
+     * Update the state
+     *
+     * @param {object} state to set
+     */
+    protected updateState(state: Metadata): void {
+        this.store.next(internalState = state);
+    }
+
     /**
      * Fetch the Metadata from the backend
      *