Use shared text system on Linux and Windows (#10098)

closes #10129
closes #10269

Release Notes:

- N/A

crates/gpui/src/platform.rs

@@ -6,6 +6,9 @@
 mod app_menu;
 mod keystroke;
 
+#[cfg(not(target_os = "macos"))]
+mod cosmic_text;
+
 #[cfg(target_os = "linux")]
 mod linux;
 
@@ -49,6 +52,9 @@ use uuid::Uuid;
 
 pub use app_menu::*;
 pub use keystroke::*;
+
+#[cfg(not(target_os = "macos"))]
+pub(crate) use cosmic_text::*;
 #[cfg(target_os = "linux")]
 pub(crate) use linux::*;
 #[cfg(target_os = "macos")]