Logging: Add log stream that only get sent warning+ logs. #5311
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We'd like to subscribe to only the most critical logs. Currently, there is no way to specify a log level threshold. This PR provides a stopgap solution.
In addition to the log_streams vector that new log sinks can push to, this PR adds a log_warning_streams vector that behaves similarly, but ostreams in this new vector only receive warning and error logs.