Store and display stats and node top lists

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

@@ -0,0 +1,22 @@
+import { Injectable } from '@angular/core';
+import { HttpClient } from '@angular/common/http';
+import { Observable } from 'rxjs';
+
+const API_BASE_URL = '/lightning/api/v1';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class LightningApiService {
+  constructor(
+    private httpClient: HttpClient,
+  ) { }
+
+  getLatestStatistics$(): Observable<any> {
+    return this.httpClient.get<any>(API_BASE_URL + '/statistics/latest');
+  }
+
+  listTopNodes$(): Observable<any> {
+    return this.httpClient.get<any>(API_BASE_URL + '/nodes/top');
+  }
+}