Issue 135 Add TestomatHook and deferred artifact upload support

[GolubNick]

Summary

This PR introduces two new features:

• JSONL artifact export for deferred artifact uploads.
• A new TestomatHook extension API for customizing the reporting lifecycle.

Changes

JSONL Artifact Export

• Added automatic export of artifact metadata to a JSONL file.
• Added configurable export path via testomatio.artifact.json.path.
• Added the ability to disable JSONL export via testomatio.artifact.json.disable.

TestomatHook

• Introduced the TestomatHook extension interface.
• Added lifecycle hooks that execute before and after the reporter's default logic.
• Allows users to extend reporting with custom logic such as logging, external API calls, and artifact processing without modifying the built-in listeners.