add data-log service

src/app/services/data-logs.service.ts

+import { Injectable } from '@angular/core';
+import { Observable, Subject, from } from 'rxjs';
+import { map, concatMap } from 'rxjs/operators';
+import { HttpClient } from '@angular/common/http';
+import { Resource, IResource, ResourceRO, IResourceFormat } from '../models/resource.model';
+import { APP_CONFIG } from './app-config.service';
+
+@Injectable()
+export class DataLogsService {
+
+  resourceServiceUrl: string;
+  limit: number;
+  pageNumber: number;
+  sortOptions: {
+    value: string,
+    order: string,
+  };
+
+  private _searchChangeSubject: Subject<any>;
+
+  constructor(
+      private _httpClient: HttpClient) {
+    this.resourceServiceUrl = `${APP_CONFIG.restHeartAggregations.url}uuidToSessionId?avars=`;
+    this._searchChangeSubject = new Subject<any>();
+    this.limit = 10;
+    this.pageNumber = 1;
+  }
+
+  uuidToSessionId(uuid): Observable<any[]> {
+    const query = { uuid : uuid };
+    const stringQuery = JSON.stringify(query);
+    return this._httpClient.get<any[]>(this.resourceServiceUrl + stringQuery).pipe(
+      map((response) => {
+        return response;
+      }),
+    );
+  }
+}