Fixes #243: [Fleet Execution] [Hono Integration Example]

[davideast]

This PR introduces a new example demonstrating how to integrate the Jules SDK with a Hono backend application.

It includes:

• A POST /api/sessions/create endpoint to initiate basic Repoless sessions.
• A GET /api/sessions/:id/status endpoint to check the current status of an ongoing session.
• A GET /api/sessions/:id/stream endpoint to stream session activities in real-time via Server-Sent Events (SSE).
• A standalone package.json with necessary dependencies.
• A README.md containing instructions on how to install dependencies, configure the JULES_API_KEY, and run the local server.
• An update to packages/core/README.md linking to this new example.

Fixes #243

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PR created automatically by Jules for task 7838249491053480699 started by @davideast

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