nmcli: show bandwidth on wifi device output

Fernando Fernández Mancera requested to merge ff/wifi_bandwidth into main


Add support to show bandwidth announced by access point.


Please read https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/blob/main/CONTRIBUTING.md before opening the merge request. In particular, check that:

  • the subject for all commits is concise and explicative
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  • the source is properly formatted
  • any relevant documentation is up to date
  • you have added unit tests if applicable

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