Open new windows with a default size and position (#9204)

This PR changes GPUI to open windows with a default size and location,
and to otherwise inherit from their spawning window.

Note: The linux build now crashes on startup.

Release Notes:

- N/A

---------

Co-authored-by: Nathan <nathan@zed.dev>
Co-authored-by: Ezekiel Warren <zaucy@users.noreply.github.com>

crates/editor/src/inlay_hint_cache.rs

@@ -2664,6 +2664,7 @@ pub mod tests {
         cx.executor().run_until_parked();
         let editor =
             cx.add_window(|cx| Editor::for_multibuffer(multibuffer, Some(project.clone()), cx));
+
         let editor_edited = Arc::new(AtomicBool::new(false));
         let fake_server = fake_servers.next().await.unwrap();
         let closure_editor_edited = Arc::clone(&editor_edited);