Add utility method getService() to Info object

Author: Stypox

extractor/src/main/java/org/schabi/newpipe/extractor/Info.java

@@ -1,5 +1,6 @@
 package org.schabi.newpipe.extractor;
 
+import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.linkhandler.LinkHandler;
 
 import java.io.Serializable;
@@ -72,6 +73,15 @@ public int getServiceId() {
         return serviceId;
     }
 
+    public StreamingService getService() {
+        try {
+            return NewPipe.getService(serviceId);
+        } catch (final ExtractionException e) {
+            // this should be unreachable, as serviceId certainly refers to a valid service
+            throw new RuntimeException("Info object has invalid service id", e);
+        }
+    }
+
     public String getId() {
         return id;
     }