Replace ItemTag API with new API that also expands to Tiles and Entities

By: Bjarne Koll <LynxPlay101@gmail.com>

paper-api/src/main/java/org/bukkit/persistence/PersistentDataAdapterContext.java

@@ -0,0 +1,18 @@
+package org.bukkit.persistence;
+
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * This interface represents the context in which the {@link PersistentDataType} can
+ * serialize and deserialize the passed values.
+ */
+public interface PersistentDataAdapterContext {
+
+    /**
+     * Creates a new and empty meta container instance.
+     *
+     * @return the fresh container instance
+     */
+    @NotNull
+    PersistentDataContainer newPersistentDataContainer();
+}