Add option to set placeholder prefix and suffix

Core/src/main/java/com/craftaro/core/chat/MiniMessagePlaceholder.java

@@ -1,11 +1,15 @@
 package com.craftaro.core.chat;
 
 public class MiniMessagePlaceholder {
+
+    public static String PLACEHOLDER_PREFIX = "%";
+    public static String PLACEHOLDER_SUFFIX = "%";
+
     private final String placeholder;
     private final String value;
 
     public MiniMessagePlaceholder(String placeholder, String value) {
-        this.placeholder = "%" + placeholder + "%";
+        this.placeholder = PLACEHOLDER_PREFIX + placeholder + PLACEHOLDER_SUFFIX;
         this.value = value;
     }
 
@@ -16,4 +20,38 @@ public String getPlaceholder() {
     public String getValue() {
         return this.value;
     }
+
+    public static void setPlaceholderPrefix(String prefix) {
+        if (prefix == null) {
+            throw new IllegalArgumentException("Prefix cannot be null");
+        }
+        if (prefix.isEmpty()) {
+            throw new IllegalArgumentException("Prefix cannot be empty");
+        }
+        if (prefix.equals(PLACEHOLDER_SUFFIX)) {
+            throw new IllegalArgumentException("Prefix cannot be the same as the suffix");
+        }
+        PLACEHOLDER_PREFIX = prefix;
+    }
+
+    public static void setPlaceholderSuffix(String suffix) {
+        if (suffix == null) {
+            throw new IllegalArgumentException("Suffix cannot be null");
+        }
+        if (suffix.isEmpty()) {
+            throw new IllegalArgumentException("Suffix cannot be empty");
+        }
+        if (suffix.equals(PLACEHOLDER_PREFIX)) {
+            throw new IllegalArgumentException("Suffix cannot be the same as the prefix");
+        }
+        PLACEHOLDER_SUFFIX = suffix;
+    }
+
+    public static String getPlaceholderPrefix() {
+        return PLACEHOLDER_PREFIX;
+    }
+
+    public static String getPlaceholderSuffix() {
+        return PLACEHOLDER_SUFFIX;
+    }
 }