redis: complete redis.utils stubs (#5067)

stubs/redis/redis/utils.pyi

@@ -1,8 +1,20 @@
-from typing import Any
+from typing import Any, ContextManager, Optional, Text, TypeVar, overload
+from typing_extensions import Literal
 
-HIREDIS_AVAILABLE: Any
+from .client import Pipeline, Redis
 
-def from_url(url, db=..., **kwargs): ...
-def pipeline(redis_obj): ...
+_T = TypeVar("_T")
+
+HIREDIS_AVAILABLE: bool
+@overload
+def from_url(url: Text, db: Optional[int] = ..., *, decode_responses: Literal[True], **kwargs: Any) -> Redis[str]: ...
+@overload
+def from_url(url: Text, db: Optional[int] = ..., *, decode_responses: Literal[False] = ..., **kwargs: Any) -> Redis[bytes]: ...
+@overload
+def str_if_bytes(value: bytes) -> str: ...  # type: ignore
+@overload
+def str_if_bytes(value: _T) -> _T: ...
+def safe_str(value: object) -> str: ...
+def pipeline(redis_obj: Redis) -> ContextManager[Pipeline]: ...
 
 class dummy: ...