feat: add toggle option to wait for node command to complete #925
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This PR adds a new option for node commands where we can choose to wait, or not, for the command to complete. It fixes #924 allowing to start GUI applications like Wireshark without blocking the core's GUI.
The default behavior is to wait for completion in order to keep compatibility with previous versions.
Furthermore, I overrode the from_yaml method in NodeCommand to deal with existent configurations that do not have a "wait" value defined. In future versions, if this it no longer a problem, this method can be removed.