feat(trunk-ir): port validation, parser to arena IR and add SignatureConversion patterns

crates/trunk-ir/src/arena/dialect/mod.rs

@@ -34,7 +34,7 @@ mod tests {
     }
 
     fn make_func_type(types: &mut TypeInterner) -> crate::arena::TypeRef {
-        types.intern(TypeDataBuilder::new(Symbol::new("func"), Symbol::new("fn")).build())
+        types.intern(TypeDataBuilder::new(Symbol::new("core"), Symbol::new("func")).build())
     }
 
     // ================================================================

crates/trunk-ir/src/arena/mod.rs

@@ -10,11 +10,13 @@
 pub mod context;
 pub mod dialect;
 pub mod ops;
+pub mod parser;
 pub mod printer;
 pub mod refs;
 pub mod rewrite;
 pub mod transforms;
 pub mod types;
+pub mod validation;
 pub mod walk;
 
 pub use context::{