Fix hot restart race by pausing the app before hot restart #1361
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Issue
A race between the app hitting a breakpoint and a hot restart was causing hot restart to hang periodically.
The race sequence was as following:
not resume the isolate.
As a result, the app is paused and hot restart hangs.
Solution
Pause the app (if it is not already paused) forcefully and wait for the either breakpoint or the pause event on
the debug stream before hot restarting to prevent this from happening.
Closes: #1359