Added protected TypeRef(Type) constructor so that subclasses can specify

Type directly rather than via the other constructor.

Author: scottslewis

mcp-core/src/main/java/io/modelcontextprotocol/json/TypeRef.java

@@ -32,6 +32,10 @@ protected TypeRef() {
 		this.type = ((ParameterizedType) superClass).getActualTypeArguments()[0];
 	}
 
+	protected TypeRef(Type type) {
+		this.type = type;
+	}
+
 	/**
 	 * Returns the captured type information.
 	 * @return the Type representing the actual type argument captured by this TypeRef