Auto merge of #33224 - alexcrichton:create-exit-status, r=aturon

std: Allow creating ExitStatus from raw values

Sometimes a process may be waited on externally from the standard library, in
which case it can be useful to create a raw `ExitStatus` structure to return.
This commit extends the existing Unix `ExitStatusExt` extension trait and adds a
new Windows-specific `ExitStatusExt` extension trait to do this. The methods are
currently called `ExitStatus::from_raw`.

cc #32713

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