Adds a new example project task-manager-with-notifications that demonstrates a full event-driven workflow.

[deepith-18]

Features included:

• API: Endpoints to Create, List, and Get tasks.
• Background Jobs: A ProcessTask worker that handles task.created events.
• State Management: Persists task data using the KV state plugin.
• Notifications: Simulates email sending upon task completion.

Implementation details:

• Configured with motia.config.cjs and a window polyfill to ensure plugins load correctly in the Node environment.
• Updated package.json to use "type": "module".
• Added safety checks for Redis data (manual JSON stringify/parse) to prevent runtime crashes.

Tested locally end-to-end: API requests successfully trigger the background worker and log the final email notification.