fix(vscode): add a timeout on the stream reading tasks

[leops]

Summary

This PR fixes a bug in Windows where the stdout and stderr streams of the CLI child process spawned by the extension would never close, making it hang indefinitely on startup. I've modified this logic to use a one second timeout to allow the closing event to be emitted after the child process has exited, after which the code will continue with the buffer content that has been flushed already. I've also included the logging code I've used to debug the issue, as I don't think it's particularly and issue if that's included in the debugging logs of the extension as it may help us figure out more information on this issue in the future.

Test Plan

I've restarted the extension locally a few times until I could reproduce the issue (no stream events other than data being logged) and confirmed the extension was still starting up correctly in this case.

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