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Support async in `Command`, `MessageHandler` and other core protocols #274

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pkg-config 0.29.2_3 is already installed and up-to-date. To reinstall 0.29.2_3, run: brew reinstall pkg-config

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graphviz 11.0.0 is already installed and up-to-date. To reinstall 11.0.0, run: brew reinstall graphviz