Add data source properties retrieval and update related components

jambotron-ui/src/app/services/system.service.ts

@@ -3,6 +3,7 @@ import {HttpClient} from '@angular/common/http';
 import {Observable} from 'rxjs';
 import {Tutorial} from '../models/tutorial.model';
 import {Bean} from '../models/Bean';
+import {NameValueItem} from '../models/name-value-item';
 
 @Injectable({
   providedIn: 'root'
@@ -12,6 +13,10 @@ export class SystemService {
   baseUrl : string = 'http://localhost:8080/api/system';
   constructor(private http: HttpClient) { }
 
+  getDataSourceProperties(): Observable<NameValueItem[]>{
+    return this.http.get<NameValueItem[]>(this.baseUrl + "/data-source-properties")
+  }
+
   getAllBeans(): Observable<Bean[]> {
     return this.http.get<Bean[]>(this.baseUrl+"/beans");
   }