wayland: Implement activate() API and use portals to open URLs and paths (#13336)

This PR consists of two main changes:
1. The first commit changes the `open` crate for opening URLs/paths for
the `OpenURI` desktop portal. This fixes the activation token not being
passed to programs (at least on KDE).
2. The second commit implements the window `activate()` API on Wayland.
This allows KWin and Mutter to show a visual indicator when the window
is requesting attention. (see
https://github.com/zed-industries/zed/issues/12557)

![image](https://github.com/zed-industries/zed/assets/71973804/ce148f8e-28fd-4249-8f8d-3a5828ed6f83)


Release Notes:

- N/A

crates/gpui/Cargo.toml

@@ -124,7 +124,6 @@ wayland-protocols = { version = "0.31.2", features = [
 ] }
 wayland-protocols-plasma = { version = "0.2.0", features = ["client"] }
 oo7 = "0.3.0"
-open = "5.1.2"
 filedescriptor = "0.8.2"
 x11rb = { version = "0.13.0", features = [
     "allow-unsafe-code",