feat: Implement smooth resizing on X11 with _NET_WM_SYNC_REQUEST

Without smooth resizing, the window will appear to jitter when it is being
resized. This is because X11 completes the resize before the client gets a
chance to draw a new frame.

This is fixed by using the "sync" extension to ensure that the resize of the
X11 window is synchronized with the server.

Closes #2153

Cargo.toml

@@ -262,6 +262,7 @@ x11rb = { version = "0.13.0", default-features = false, features = [
     "dl-libxcb",
     "randr",
     "resource_manager",
+    "sync",
     "xinput",
     "xkb",
 ], optional = true }