fix: Wayland resolution

1. Add filed `scale` in `message SwitchDisplay`(`message.proto`).
2. Add new function to get all display info.
3. Add help link of KDE Plasma Wayland.

Signed-off-by: fufesou <linlong1266@gmail.com>

Cargo.toml

@@ -81,3 +81,8 @@ winapi = { version = "0.3", features = [
 
 [target.'cfg(target_os = "macos")'.dependencies]
 osascript = "0.3"
+
+[target.'cfg(target_os = "linux")'.dependencies]
+sctk = { package = "smithay-client-toolkit", version = "0.20.0", default-features = false, features = [
+    "calloop",
+] }