feat: Add dataset typing

Author: caffeine-addictt

src/thread/_types.py

@@ -4,7 +4,7 @@
 Documentation: https://thread.ngjx.org/docs/v1.0.0
 """
 
-from typing import Any, Literal, Callable, Union, Sized
+from typing import Any, Literal, Callable, Union, Sized, Sequence
 from typing_extensions import (
     ParamSpec,
     TypeVar,
@@ -57,3 +57,11 @@ def __getitem__(self, i: int) -> _Dataset_T: ...
 @runtime_checkable
 class SupportsLengthGetItem(SupportsGetItem[_Dataset_T], SupportsLength, Protocol):
     pass
+
+
+Dataset = Union[
+    Sequence[_Dataset_T],
+    SupportsLength,
+    SupportsGetItem[_Dataset_T],
+    SupportsLengthGetItem[_Dataset_T],
+]