Fix Wayland window creation to comply with Weston 15 xdg-shell protocol

[pleasurefish]

The previous implementation did not properly follow the xdg-shell configure/commit flow required by Weston 15, causing window creation and resize operations to fail.

Changes:

• Add xdg_toplevel_listener to handle configure events with width/height parameters
• Implement proper configure/ack/commit sequence for window initialization
• Add mConfigured flag to track surface configuration state
• Wait for configure event before proceeding with window show/resize operations
• Move callback function implementations after WaylandWindow class definition to resolve forward declaration issues

The correct flow is now:

1. Request state change (set_fullscreen/unset_fullscreen)
2. Commit surface (wl_surface_commit)
3. Wait for configure event from compositor
4. Acknowledge configure (xdg_surface_ack_configure)
5. Proceed with rendering

This ensures compatibility with Weston 15's stricter xdg-shell protocol enforcement where surfaces must be configured before they can be displayed.

[kexia01]

Thanks for your contribution! We will look at it and test it.
Merge this internally and add it to the next release if pass.

[pleasurefish]

thanks for your information, looking forward to your update.