Add toString, equals, and hashCode to Metadata

common/src/main/java/us/myles/ViaVersion/api/minecraft/metadata/Metadata.java

@@ -1,5 +1,7 @@
 package us.myles.ViaVersion.api.minecraft.metadata;
 
+import java.util.Objects;
+
 public class Metadata {
     private int id;
     private MetaType metaType;
@@ -38,4 +40,32 @@ public class Metadata {
     public void setValue(Object value) {
         this.value = value;
     }
+
+    @Override
+    public boolean equals(final Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        Metadata metadata = (Metadata) o;
+        if (id != metadata.id) return false;
+        if (!Objects.equals(metaType, metadata.metaType)) return false;
+        return Objects.equals(value, metadata.value);
+    }
+
+    @Override
+    public int hashCode() {
+        int result = id;
+        result = 31 * result + (metaType != null ? metaType.hashCode() : 0);
+        result = 31 * result + (value != null ? value.hashCode() : 0);
+        return result;
+    }
+
+    @Override
+    public String toString() {
+        return "Metadata{" +
+                "id=" + id +
+                ", metaType=" + metaType +
+                ", value=" + value +
+                '}';
+    }
 }