fix: typescript4.3+ 属性装饰器不支持Object.defineProperty

[xizher]

Decorators in 4.3.x can't use Object.defineProperty anymore.

export function ObservableProperty (fireName: string) {
  return function (target: Observable<any>, key: string) { // eslint-disable-line
    let property = target[key]
    const getter = () => property
    const setter = (newVal: unknown) => {
      target.fire(fireName, {
        [key]: newVal,
        [`old${key.replace(key[0], key[0].toUpperCase())}`]: property,
      })
      property = newVal
    }
    Object.defineProperty(target, key, {
      get: getter,
      set: setter,
      enumerable: true,
      configurable: true,
    })
  }
}

暂定处理方法：等待装饰器提案完善