Refactor: Implement Record Layouts and Optimized Field Access

Introduces a new `RecordLayout` system for efficient and type-safe
record handling.

Key changes:
- `RecordLayout` struct with `O(1)` field lookup using FMap
  optimization.
- Field accessors (`.name`) are now first-class callable values.
- Parser recognizes dot-prefixed identifiers as field accessors.
- Binder and TypeChecker handle field accessors.
- Optimizer transforms field accessor calls into specialized `GetField`
  nodes.
- VM executes `GetField` efficiently by directly accessing record
  values.
- Adds a new `records.myc` example showcasing record features.
- Improves comparison logic for records to use pointer equality for
  layout.

src/ast/compiler/binder.rs

@@ -189,6 +189,10 @@ impl Binder {
                 Err("Unexpected 'Parameter' node in general binder context. This should be handled via 'bind_pattern'.".to_string())
             }
 
+            UntypedKind::FieldAccessor(k) => {
+                Ok(self.make_node(node.identity.clone(), BoundKind::FieldAccessor(*k)))
+            }
+
             UntypedKind::If {
                 cond,
                 then_br,