Draft: Add a 'wifi.channel-width' setting
Summary
Introduce a new 'wifi.channel-width' property that allows the use of a larger bandwidth in AP mode.
Purpose
At the moment, the AP mode always uses a 20MHz channel. To increase performances, let users specify a larger bandwidth; in that case, they also need to set a fixed channel.
When acting as client, the width is determined by the AP and so the property is not honored. It is actually forbidden to set a specific channel width in infrastructure mode.
Checklist
Please read https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/blob/main/CONTRIBUTING.md before opening the merge request. In particular, check that:
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the subject for all commits is concise and explicative -
the message for all commits explains the reason for the change -
the source is properly formatted -
any relevant documentation is up to date -
you have added unit tests if applicable -
the NEWS file is updated when the change deserves to be mentioned, for example for new features, behavior changes, API deprecations, etc.