feat: add edit holiday component (#783)

Fixes: #750

src/app/organization/organization.service.ts

@@ -477,6 +477,24 @@ export class OrganizationService {
     return this.http.get(`/holidays/${holidayId}`);
   }
 
+  /**
+   * Get Holiday template.
+   * @returns {Observable<any>} Holiday data.
+   */
+  getHolidayTemplate(): Observable<any> {
+    return this.http.get('/holidays/template');
+  }
+
+  /**
+   * Update Holiday.
+   * @param holidayId Holiday Id to be updated.
+   * @param holidayData Holiday data to be updated.
+   * @returns {Observable<any>}
+   */
+  updateHoliday(holidayId: any, holidayData: any): Observable<any> {
+    return this.http.put(`/holidays/${holidayId}`, holidayData);
+  }
+
   /**
    * Delete Holiday.
    * @param holidayId Holiday Id to be deleted.