Create node rankings page with 3 different rankings

frontend/src/app/lightning/lightning-api.service.ts

@@ -2,7 +2,7 @@ import { Injectable } from '@angular/core';
 import { HttpClient, HttpParams } from '@angular/common/http';
 import { Observable } from 'rxjs';
 import { StateService } from '../services/state.service';
-import { INodesRanking, ITopNodesPerCapacity, ITopNodesPerChannels } from '../interfaces/node-api.interface';
+import { INodesRanking, IOldestNodes, ITopNodesPerCapacity, ITopNodesPerChannels } from '../interfaces/node-api.interface';
 
 @Injectable({
   providedIn: 'root'
@@ -75,4 +75,10 @@ export class LightningApiService {
       this.apiBasePath + '/api/v1/lightning/nodes/rankings/channels'
     );
   }
+
+  getOldestNodes$(): Observable<IOldestNodes[]> {
+    return this.httpClient.get<IOldestNodes[]>(
+      this.apiBasePath + '/api/v1/lightning/nodes/rankings/age'
+    );
+  }
 }