feat: derive structural equality and hashing for AST nodes

Cargo.toml

@@ -22,6 +22,16 @@ case_insensitive_hashmap = "1"
 version = "1"
 features = ["derive"]
 
+[dependencies.ordered-float]
+version = "5"
+default-features = false
+features = ["serde"]
+
+[dependencies.rustc-hash]
+version = "2"
+default-features = false
+features = ["std"]
+
 [dev-dependencies.insta]
-version = "1.44"
-features = ["yaml"]
+version = "1.46"
+features = ["yaml", "redactions"]