gpui: Add svg example (#17315)

This PR adds an example for working with SVGs.

Release Notes:

- N/A

crates/gpui/Cargo.toml

@@ -181,6 +181,10 @@ path = "examples/input.rs"
 name = "shadow"
 path = "examples/shadow.rs"
 
+[[example]]
+name = "svg"
+path = "examples/svg/svg.rs"
+
 [[example]]
 name = "text_wrapper"
 path = "examples/text_wrapper.rs"