Add return type annotations to from_url methods

[cheizdo2-art]

Description

Add return type annotations to from_url() methods in asyncio module.

Motivation

Currently, redis.asyncio.client.Redis.from_url() and redis.asyncio.utils.from_url()
lack return type annotations, causing MyPy to report no-untyped-call errors when used
in strict typing mode.

This PR improves type safety and IDE autocomplete support for users of the asyncio Redis client.

Changes

• Added return type annotation -> _RedisT to Redis.from_url() classmethod
• Added parameter and return type annotations to utils.from_url() helper
• Updated TYPE_CHECKING imports in utils.py for forward references

Example Usage (Before/After)

Before (requires type:ignore):

import redis.asyncio as redis

async def connect():
    client = await redis.from_url("redis://localhost")  # type: ignore[no-untyped-call]
After (fully typed):
import redis.asyncio as redis

async def connect():
    client = await redis.from_url("redis://localhost")  # ✅ No type:ignore needed

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[petyaslavova]

Hi @cheizdo2-art, thank you for your contribution! We will review your change soon.

[Copilot]

Pull Request Overview

This PR adds return type annotations to from_url() methods in the asyncio module to improve type safety and resolve MyPy no-untyped-call errors in strict typing mode.

• Added return type annotation -> _RedisT to the Redis.from_url() classmethod
• Added parameter and return type annotations to the utils.from_url() helper function
• Updated TYPE_CHECKING imports in utils.py to support forward references

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
redis/asyncio/utils.py	Added type annotations to from_url() function and imported Any type
redis/asyncio/client.py	Added return type annotation and proper cls parameter typing to Redis.from_url() classmethod

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