Add support for agent self-restarting

[vikman90]

Parent issue:

• Data persistence model redesign wazuh#22887

Description

We need to develop a Minimum Viable Product (MVP) that enables the Wazuh agent to support a command for self-restart.

Functional requirements

• The agent should accept a command to initiate a restart.
• The agent should perform a clean restart, ensuring all processes are correctly shut down and restarted.
• Log the restart event, including the timestamp and initiating command details.

Non-functional requirements

• The restart process should not exceed a predefined time limit (e.g., 30 seconds) to minimize downtime.

Implementation restrictions

• Start from the Spike issue: Agent command manager #4
• Ensure that the implementation is thoroughly tested with unit tests and integration tests.

Plan

1. Add support for agent self-restarting: Design Phase #63
   • Outline the design and workflow for the restart command.
2. Add support for agent self-restarting: Development Phase #77
   • Implement the command to initiate a restart.
   • Add logging for restart events.
3. Testing Phase:
   • Develop and execute unit tests for the new functionality.
   • Perform integration tests to ensure the command works across different environments.