Add cosmic_atspi_v1 protocol

Used to provide a backend for `AtspiDevice` in `at-spi2-core`, so Orca
keybindings can work.

src/wayland/handlers/mod.rs

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-3.0-only
 
 pub mod alpha_modifier;
+pub mod atspi;
 pub mod buffer;
 pub mod compositor;
 pub mod data_control;