feat: add LocalizationConfiguration::directory() method

plugin-utils/src/main/java/org/axolotsh/pluginutils/configuration/LocalizationConfiguration.java

@@ -10,6 +10,7 @@ import org.bukkit.plugin.Plugin;
 
 import lombok.AllArgsConstructor;
 import lombok.Builder;
+import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.experimental.Accessors;
 
@@ -18,6 +19,7 @@ import lombok.experimental.Accessors;
 @NoArgsConstructor
 @Builder(toBuilder = true)
 public class LocalizationConfiguration implements IConfiguration {
+    @Getter
     @Builder.Default
     private String directory = "locales";