Improve type hints of from_url method for async Redis client. (#3796)

* Add return type annotations to from_url methods

- Add return type annotation to Redis.from_url() in client.py
- Add parameter and return type annotations to utils.from_url()
- Improves type safety and IDE autocomplete support
- Resolves MyPy no-untyped-call errors for users

* Reorder import statements in utils.py

---------

Co-authored-by: cheizdo2-art <cheizdo2-art@users.noreply.github.com>
Co-authored-by: petyaslavova <petya.slavova@redis.com>

Author: cheizdo2-art

redis/asyncio/client.py

@@ -126,7 +126,7 @@ class Redis(
 
     @classmethod
     def from_url(
-        cls,
+        cls: Type["Redis"],
         url: str,
         single_connection_client: bool = False,
         auto_close_connection_pool: Optional[bool] = None,