Reorganizing the code related to maintenance push notifications.

[petyaslavova]

Pull Request check-list

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• Do tests and lints pass with this change?
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• Is the new or changed code fully tested?
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Description of change

Extracting maintenance push notifications logic into separate abstract classes. Using multiple inheritance for Connection and ConnectionPool classes to expose the maintenance push notifications for the existing connections.

[Copilot]

Pull Request Overview

This PR reorganizes the maintenance push notifications code by extracting logic into separate abstract classes and using multiple inheritance to expose maintenance push notifications for existing Connection and ConnectionPool classes.

• Introduced abstract classes for maintenance push notifications functionality
• Updated connection handling to use the new _get_socket() method instead of direct _sock access
• Modified test configurations to support cache configurations and different connection types

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

File	Description
tests/test_maint_notifications_handling.py	Updated test methods to use new socket access patterns and added cache configuration support
tests/test_maint_notifications.py	Added socket import and updated MockConnection to inherit from new abstract class
redis/maint_notifications.py	Updated type hints to use new MaintNotificationsAbstractConnection instead of ConnectionInterface

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