ui: Add functions for generating textual representations of key bindings (#15287)

This PR adds some helper functions in the `ui` crate that can be used to
get textural representations of keystrokes or key bindings.

Release Notes:

- N/A

crates/ui/src/ui.rs

@@ -7,6 +7,7 @@ mod clickable;
 mod components;
 mod disableable;
 mod fixed;
+mod key_bindings;
 pub mod prelude;
 mod selectable;
 mod styled_ext;
@@ -19,6 +20,7 @@ pub use clickable::*;
 pub use components::*;
 pub use disableable::*;
 pub use fixed::*;
+pub use key_bindings::*;
 pub use prelude::*;
 pub use styled_ext::*;
 pub use styles::*;