Refactor _StoreCallSig to inline form

While working on python/mypy#16715 I've noticed that `_StoreCallSig` uses class form, while having `__kw` field. This field will be mangled. This is not something typing users want. See python/cpython#129567

src/hydra_zen/wrapper/_implementations.py

@@ -967,18 +967,18 @@ def get_name(target: _HasName) -> str:
     return name
 
 
-class _StoreCallSig(TypedDict):
-    """Arguments for ZenStore.__call__
-
-    This default dict enables us to easily update/merge the default arguments for a
-    specific ZenStore instance, in support of self-partialing behavior."""
-
-    name: Union[NodeName, Callable[[Any], NodeName]]
-    group: Union[GroupName, Callable[[Any], GroupName]]
-    package: Optional[Union[str, Callable[[Any], str]]]
-    provider: Optional[str]
-    __kw: dict[str, Any]  # kwargs passed to to_config
-    to_config: Callable[[Any], Any]
+# Arguments for ZenStore.__call__
+#
+# This default dict enables us to easily update/merge the default arguments for a
+# specific ZenStore instance, in support of self-partialing behavior.
+_StoreCallSig = TypedDict("_StoreCallSig", [
+    ("name", Union[NodeName, Callable[[Any], NodeName]]),
+    ("group", Union[GroupName, Callable[[Any], GroupName]]),
+    ("package", Optional[Union[str, Callable[[Any], str]]]),
+    ("provider", Optional[str]),
+    ("__kw", dict[str, Any]),  # kwargs passed to to_config
+    ("to_config", Callable[[Any], Any]),
+])
 
 
 # TODO: make frozen dict