chore(core): add fake typing module (not included in build)

core/src/typing.py

@@ -0,0 +1,18 @@
+TYPE_CHECKING = False
+
+class _GenericTypingObject:
+    def __init__(self, *args, **kwargs):
+        pass
+
+    def __getattr__(self, key):
+        # property access: P.kwargs
+        return object
+
+    def __getitem__(self, key):
+        # dict-like access: Generic[T], Generic[K, V]
+        return self
+
+_TYPING_OBJECT = _GenericTypingObject()
+
+def __getattr__(key):
+    return _TYPING_OBJECT