try to add editable attribute to node when dumpWindowHierarchy

[caofengbin]

获取的节点，增加editable属性，这个属性是辅助功能默认支持的。增加之后，部分输入框组件该属性为true。示例：

class="android.widget.EditText" content-desc="" checkable="false" checked="false" clickable="true" enabled="true" focusable="true" focused="true" scrollable="false" long-clickable="true" password="false" selected="false" visible-to-user="true" bounds="[154,115][769,218]" editable="true" drawing-order="2" hint="年中策略会|5天5场 首席前瞻机会" display-id="0" />\r\n

issues中有类似反馈 https://github.com/openatx/uiautomator2/issues/957