Initial numeral system implementation

Author: MDLC01

Cargo.lock

@@ -2,7 +2,7 @@
 name = "codex"
 version = "0.2.0"
 authors = ["The Typst Project Developers"]
-edition = "2021"
+edition = "2024"
 description = "Human-friendly notation for Unicode symbols."
 repository = "https://github.com/typst/codex"
 readme = "README.md"
@@ -11,9 +11,13 @@ categories = ["encoding", "text-processing"]
 keywords = ["unicode", "symbols"]
 
 [features]
-default = ["styling"]
+default = ["numeral-systems", "styling"]
+numeral-systems = ["chinese-number"]
 styling = []
 _test-unicode-conformance = ["ureq"]
 
+[dependencies]
+chinese-number = { version = "0.7.7", default-features = false, features = ["number-to-chinese"], optional = true }
+
 [build-dependencies]
 ureq = { version = "3.0.12", optional = true }