react-devtools-inline: How to remount/reuse DevTools frontend after unmount

DevTools closes the bridge whenever it is unmounted [(Link to relevant code)](https://github.com/facebook/react/blob/master/packages/react-devtools-shared/src/devtools/views/DevTools.js#L172-L181). In the case of the chrome extension this is fine because the node is never unmounted, but in use cases with `react-devtools-inline` (eg: codesandbox), where you are only given one <DevTools/> instance this causes the bridge to be closed, and never recreated if for whatever reason <DevTools/> is unmounted (which happens when switching tabs). I am willing to submit a PR, but wanted to discuss the fix before making it - the fix I see is adding a flag to <DevTools/> to not close the bridge on unmount, and making it an opt-in flag users of <DevTools/> (recommended in the case of react-devtools-inline). Adding an ability to manually access the bridge would then let the developer manually control the lifecycle - but I'm unsure the risk/issue of keeping a dangling bridge open, so I don't see this as strictly necessary. React version: N/A React-devtools-inline: 4.9.0 ## Steps To Reproduce 1. Create a code-sandbox React environment 2. Open React DevTools tab 3. Switch to Problems tab (or any other tab) 4. Switch back to React DevTools tab 5. Bridge has been closed, `index.js:55 Cannot send message "highlightNativeElement" through a Bridge that has been shutdown.` is printed in console. New react nodes can not be inspected. <!-- Your bug will get fixed much faster if we can run your code and it doesn't have dependencies other than React. Issues without reproduction steps or code examples may be immediately closed as not actionable. --> Link to code example: N/A Code example isn't relevant, any CodeSandbox will reproduce this. (even with no additional code) <!-- Please provide a CodeSandbox (https://codesandbox.io/s/new), a link to a repository on GitHub, or provide a minimal code example that reproduces the problem. You may provide a screenshot of the application if you…