staging/dialog: Add "dialog" protocol

Open Carlos Garnacho requested to merge carlosg/wayland-protocols:wip/dialogs into main

This simple protocol definition allows clients to express a "dialog" relationship of a toplevel with its parent and extend the possible hints. This allows compositors to attach certain behavior according to these hints.

Requirements for merging

  • Review
  • Implementations
  • ACKs from members

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