Adding CLAIM option to XREADGROUP command + unit tests

[petyaslavova]

Pull Request check-list

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• Do tests and lints pass with this change?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?

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Description of change

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[Copilot]

Pull Request Overview

This PR adds support for the claim_min_idle_time parameter to the xreadgroup command in Redis, enabling automatic claiming of pending messages based on their idle time. This feature allows consumers to reclaim messages from other consumers that have been pending for a specified duration.

• Added claim_min_idle_time parameter to the xreadgroup method in redis/commands/core.py
• Modified response parsers to handle extended message format with idle time and delivery count when using claim_min_idle_time
• Added comprehensive test coverage for single and multiple stream scenarios in both sync and async test files

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 26 comments.

File	Description
redis/commands/core.py	Added claim_min_idle_time parameter with validation and command building logic
redis/_parsers/helpers.py	Updated parsers to handle extended response format including idle time and delivery count
tests/test_commands.py	Added three test methods and helper validation function for the new feature in sync mode
tests/test_asyncio/test_commands.py	Added three test methods and helper validation function for the new feature in async mode

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