Refactor SettingsGetInformationField and PeerInformationManager to improve error handling and validate UUID format

https://github.com/nosial/Socialbox-PHP/issues/60

src/Socialbox/Classes/StandardMethods/Settings/SettingsGetInformationField.php

@@ -25,6 +25,7 @@
             {
                 throw new MissingRpcArgumentException('field');
             }
+
             $fieldName = InformationFieldName::tryFrom(strtoupper($rpcRequest->getParameter('field')));
             if($fieldName === null)
             {

src/Socialbox/Managers/PeerInformationManager.php

@@ -208,6 +208,10 @@
             {
                 $peerUuid = $peerUuid->getUuid();
             }
+            elseif(!Validator::validateUuid($peerUuid))
+            {
+                throw new InvalidArgumentException('The given internal peer UUID is not a valid UUID V4');
+            }
 
             try
             {