[Devtools Feature]:let devtool component picker to spport custom renderer which runs on web

I develop a custom renderer `egreact`, it's a custom renderer for egret , egret is a game engine depend on canvas. Thanks for `injectIntoDevTools` that users can view components tree by react devtool easily.But unfortunately, `injectIntoDevTools` does't provide an interface for picking a custom renderer component. To support it, i read the source code of devtool and tried writing some inject code. Fortunately, it works well!  **Here is what i did mainly:** **1.intercept `window.listener`** ```tsx // @link https://github.com/facebook/react/blob/c3d7a7e3d72937443ef75b7e29335c98ad0f1424/packages/react-devtools-shared/src/backend/views/Highlighter/index.js#L41 function registerListenersOnWindow(window) { // This plug-in may run in non-DOM environments (e.g. React Native). if (window && typeof window.addEventListener === 'function') { window.addEventListener('click', onClick, true); window.addEventListener('mousedown', onMouseEvent, true); window.addEventListener('mouseover', onMouseEvent, true); window.addEventListener('mouseup', onMouseEvent, true); window.addEventListener('pointerdown', onPointerDown, true); window.addEventListener('pointerover', onPointerOver, true); window.addEventListener('pointerup', onPointerUp, true); } } ``` [my code](https://github.com/xingxinglieo/egreact/blob/a6214979274e29f6252f8aaacb2a86806e688db3/packages/core/src/devtool.ts#L122), intercept `window.listener` to judge is the point in the canvas, if true, mock an event which target is game engine instance. ```tsx const proxyHandler: EventHandler = function (e: MouseEvent) { const { pageX: x, pageY: y } = e const r = getCanvas().getBoundingClientRect() r.x += window.scrollX r.y += window.scrollY …