Update logging level and add key details in PreferencesHistoryManager

The logging level in PreferencesHistoryManager has been changed from info to finest. Additionally, the key related to the stored and loaded history items has been added to the log messages for more efficient debugging.

gemsfx/src/main/java/com/dlsc/gemsfx/util/PreferencesHistoryManager.java

@@ -60,7 +60,7 @@ protected void storeHistory() {
                 .map(converter::toString)
                 .collect(Collectors.joining(DELIMITER));
         preferences.put(key, result);
-        LOG.info("Stored history items.");
+        LOG.finest(String.format("Stored history items with key: '%s'.", key));
     }
 
     /**
@@ -75,6 +75,6 @@ protected void loadHistory() {
                     .map(converter::fromString)
                     .toList());
         }
-        LOG.info("Loaded history items.");
+        LOG.finest(String.format("Loaded history items with key: '%s'.", key));
     }
 }