[Request]: UX: Use stdout and stderr, and logging consistently in CLI commands. #642
Description
Feature or enhancement request details
Right now some output that should probably go to stderr is just being printed with print().
An example is: https://github.com/apple/container/blob/main/Sources/CLI/System/SystemStart.swift#L95.
All commands should log diagnostics to stderr and print data proper to stdout.
For this we could create a plaintext-to-stderr LogHandler in ContainerClient that all commands use.
At present it appears we do no logging in ContainerClient, with the single Exception of Sources/ContainerClient/ExitMonitor.swift, which is actually only used on the server side. Therefore, we can limit the scope of this to just going through each of the command groups.
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