Introduce Data Directory Configuration

[vikman90]

Parent Issue: #241

Description

Currently, the agent creates its local databases in the current working directory.

Proposal

1. Add a new configuration option, path.data, in the wazuh-agent.yml file.
2. Default value for path.data: /var/lib/wazuh-agent.
3. Store all local databases and modifiable files in the specified data directory.

[vikman90]

Work report

November 20

• Added new option path.data.
• Option parsed and applied for agent_info.db.

November 21

• Fixed a segmentation fault occurred when the agent fails to open agent_info.db.
• Worked on unit tests for the default data path change and the segmentation fault fix.
• Next steps:
  • Adapt AgentStopsWhenSignalReceived unit tests.
  • Continue with queue.db and local.db.

November 22

• Adapted path for local.db and queue.db, including unit tests.
• Defined per-platform default values.
• Tested on Linux and macOS.
• Next steps:
  • Adapt command_store.db.
  • Fix build on Windows.

November 25

• Prevented unit tests from running in parallel, since that was causing race conditions accessing the local databases.
• Adapted path for command_store.db.
• Applied some review requests.

[cborla]

Work report

November 20

• PR created.
• Included config.h to agent_info CMakeLists.
• Fixed clang format.

November 21

• Agent test adapted.