Allow compiling with Rust code (#3137)

Co-authored-by: Yuri Astrakhan <YuriAstrakhan@gmail.com>
Co-authored-by: Ian Wagner <ianwagner+github@switzerlandmail.ch>

rustutils/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "rustutils"
+version = "0.1.0"
+authors = ["MapLibre contributors"]
+description = "Core Rust utilities for MapLibre Native"
+edition = "2021"
+license = "BSD-2-Clause"
+repository = "https://github.com/maplibre/maplibre-native"
+
+[lib]
+crate-type = ["staticlib"]
+
+[dependencies]
+csscolorparser = "0.6.2"
+cxx = "1"
+
+[profile.release]
+lto = true
+codegen-units = 1