feat(serde): Add support for flags and #rest (#163)

Fixes: #161

Author: zkat

Cargo.toml

@@ -9,7 +9,7 @@ homepage = "https://kdl.dev"
 repository = "https://github.com/kdl-org/kdl-rs"
 keywords = ["kdl", "document", "serialization", "config"]
 rust-version = "1.95"
-edition = "2021"
+edition = "2024"
 
 [features]
 default = ["span", "serde"]