fix: avoid circular import in builtins.py

midas/checker/builtins.py

@@ -1,6 +1,13 @@
-from midas.checker.registry import TypesRegistry
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
 from midas.checker.types import BaseType, Type, UnitType
 
+if TYPE_CHECKING:
+    from midas.checker.registry import TypesRegistry
+
+
 BUILTIN_SUBTYPES: dict[str, set[str]] = {
     "float": {"int"},
     "int": {"bool"},