Add 'Reconnect DevTools' toolbar button #85
                
     Merged
            
            
          
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Summary
Add a simple toolbar button to
This is most useful when the "disconnected" dialog is dismissed, e.g. to inspect existing logs.
Originally suggested by @rubennorte via T192737861
Test plan
Trigger a disconnection, e.g. terminate Metro, terminate the target app, etc.
Upstreaming plan
This PR is upstream-able in principle. However, a more sophisticated mechanism to check and display connection status could be Fusebox-specific in the future, e.g. a ping/pong mechanism directly to the target: EdmondChuiHW@8234bce
devtools-frontendrepo. I've reviewed the contribution guide.