Fix Velocity modern forwarding with 1.19

Fixes https://github.com/GeyserMC/Geyser/issues/3039, #321

core/src/main/java/org/geysermc/floodgate/util/ReflectionUtils.java

@@ -255,6 +255,25 @@ public final class ReflectionUtils {
         }
     }
 
+    /**
+     * Get the value of a boolean field. This method first makes the field accessible and then gets
+     * the value.<br> This method will return false instead of throwing an exception, but it'll log
+     * the stacktrace to the console.
+     *
+     * @param instance the instance to get the value from
+     * @param field    the field to get the value from
+     * @return the value when succeeded, otherwise null
+     */
+    public static boolean getBooleanValue(Object instance, Field field) {
+        makeAccessible(field);
+        try {
+            return field.getBoolean(instance);
+        } catch (IllegalArgumentException | IllegalAccessException exception) {
+            exception.printStackTrace();
+            return false;
+        }
+    }
+
     /**
      * Get the value of the given field by finding the field and then get the value of it.
      *
@@ -300,6 +319,16 @@ public final class ReflectionUtils {
         return getCastedValue(null, field);
     }
 
+    public static boolean castedStaticBooleanValue(Field field) {
+        makeAccessible(field);
+        try {
+            return field.getBoolean(null);
+        } catch (IllegalArgumentException | IllegalAccessException exception) {
+            exception.printStackTrace();
+            return false;
+        }
+    }
+
     /**
      * Set the value of a field. This method make the field accessible and then sets the value.<br>
      * This method doesn't throw an exception when failed, but it'll log the error to the console.