Re-introduce ScopedCoroutine by using Pin
#58
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This re-adds `ScopedCoroutine` which was previously removed for being unsound by requiring that it be pinned after it has been resumed for the first time. This ensure that the coroutine cannot be forgotten without being dropped, which avoids all the previous soundness issues.
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This re-adds
ScopedCoroutinewhich was previously removed for being unsound by requiring that it be pinned after it has been resumed for the first time. This ensure that the coroutine cannot be forgotten without being dropped, which avoids all the previous soundness issues.