Refactor: Rename map to record

This commit renames `Map` to `Record` and updates all related AST nodes,
binders, type checkers, and runtime values to reflect this change. This
is a semantic change to better align with common programming language
terminology.

src/ast/compiler/tco.rs

@@ -108,12 +108,12 @@ impl TCO {
                     ..node
                 }
             },
-            BoundKind::Map { entries } => {
-                let new_entries = entries.into_iter().map(|(k, v)| {
+            BoundKind::Record { fields } => {
+                let new_fields = fields.into_iter().map(|(k, v)| {
                     (Self::transform(k, false), Self::transform(v, false))
                 }).collect();
                  Node {
-                    kind: BoundKind::Map { entries: new_entries },
+                    kind: BoundKind::Record { fields: new_fields },
                     ..node
                 }
             },