[Metadata generator] Add default extend to java.lang.Object for class definitions that don't inherit

Is your feature request related to a problem? Please describe.
In TS definitions, classes that don't inherit from other classes are missing the java.lang.Object inherited methods because the generator doesn't ensure they inherit from that class.

Describe the solution you'd like
Let class types that don't inherit from any class extend java.lang.Object.
e.g.

declare module org {
  export module maplibre {
    export module android {
      export module style {
        export module layers {
          export abstract class Layer extends java.lang.Object {
          }
        }
      }
    }
  }
}

找到负责类定义的元数据生成器入口点，并检查生成的 TypeScript 声明如何处理没有超类的类。比较 Layer 之类的类的输出，并验证没有继承类的类会出现 java.lang.Object；如果生成器有相关验证，请添加或运行该验证。