[mqtt] add additional details in ChannelStateTransformation logging (openhab#16782)

Signed-off-by: Jimmy Tanagra <[email protected]>

Author: jimtng

bundles/org.openhab.binding.mqtt.generic/src/main/java/org/openhab/binding/mqtt/generic/ChannelStateTransformation.java

@@ -90,7 +90,8 @@ public ChannelStateTransformation(String serviceName, String pattern, Transforma
         try {
             returnValue = transformationService.transform(pattern, value);
         } catch (TransformationException e) {
-            logger.warn("Executing the {}-transformation failed: {}", serviceName, e.getMessage());
+            logger.warn("Executing the {}-transformation failed: {}. Pattern: '{}'. Value: '{}'", serviceName,
+                    e.getMessage(), pattern, value);
         }
         return returnValue;
     }