Add zookeeper client's timeout in config

[MedvedewEM]

Add zookeeper client's timeout in config

Summary by Sourcery

Enhancements:

• Introduce a default timeout value in the Zookeeper configuration and pass it through to the underlying Kazoo client.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds a configurable ZooKeeper client timeout to the backup configuration and propagates it to the Kazoo client initialization.

File-Level Changes

Change	Details	Files
Add default ZooKeeper client timeout option to backup configuration.	Extend default ZooKeeper configuration dict with a new timeout field set to 10 seconds. Keep existing connect_timeout and other ZooKeeper config fields unchanged.	ch_backup/config.py
Pass configured ZooKeeper timeout through to KazooClient on initialization.	Update ZookeeperClient constructor to pass the timeout value from the config dict into KazooClient. Use config.get to keep the timeout parameter optional and backward compatible with existing configs.	ch_backup/zookeeper/zookeeper.py

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[sourcery-ai]

Hey - I've left some high level feedback:

• The new timeout option sits alongside an existing connect_timeout config value; consider clarifying the naming (e.g., session_timeout vs connect_timeout) or wiring both through to the Kazoo client to avoid confusion about which timeout controls what.
• In ZookeeperClient.__init__, using timeout=config['timeout'] instead of config.get('timeout') would ensure the default from ch_backup/config.py is always applied rather than silently falling back to Kazoo’s internal default when the key is absent.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The new `timeout` option sits alongside an existing `connect_timeout` config value; consider clarifying the naming (e.g., `session_timeout` vs `connect_timeout`) or wiring both through to the Kazoo client to avoid confusion about which timeout controls what.
- In `ZookeeperClient.__init__`, using `timeout=config['timeout']` instead of `config.get('timeout')` would ensure the default from `ch_backup/config.py` is always applied rather than silently falling back to Kazoo’s internal default when the key is absent.

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