Talk client doesn't respect system wide dnd (do not disturbe) setting

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Is your feature request related to a problem? Please describe.

I use heavily the DND setting of Gnome when I'm in meeting to avoid getting disturbed by a lot of notifications from different apps.

This works great for many apps, but the Talk desktop client doesn't recognize the status.

Describe the solution you'd like

I did some initial research. This seems to be needed to respect the desktop wide dnd status:

1. monitor the status: gsettings monitor org.gnome.desktop.notifications show-banners
2. if it is "false" don't send notifications to the desktop

Describe alternatives you've considered

Always set it manually directly in the talk app, but this doesn't really scale.

Additional context
Add any other context or screenshots about the feature request here.

Start by locating the Talk desktop notification entry point and use gsettings monitor org.gnome.desktop.notifications show-banners to observe the GNOME setting described in the issue. The feature is complete when notifications are suppressed while the setting is false and resume when it is true.