Add predefined notification tools: Slack, Discord, Telegram, Email (SMTP), and Webhook

[ans-4175]

Summary

Detail the implementation of predefined notification tools for the DelReact Agent system. These tools should enable agents to send messages to a variety of external platforms and systems, expanding integration capabilities beyond the agent itself.

Scope

• Implement notification tools for:
  • Slack
  • Discord
  • Telegram
  • Email (SMTP)
  • Webhook (generic HTTP POST)
• Ensure each tool can be used by agents for outbound notifications/messages.
• Tools should be configurable through environment variables or agent configuration.
• Provide documentation and usage examples for each notification tool.

Motivation

Providing built-in notification/integration tools empowers agent workflows to communicate outcomes or alerts to external systems and teams, making automations more actionable and interactive.

Acceptance Criteria

• Slack notification tool implemented and tested.
• Discord notification tool implemented and tested.
• Telegram notification tool implemented and tested.
• Email (SMTP) notification tool implemented and tested.
• Webhook notification tool implemented and tested.
• Documentation for each notification tool, including setup and usage.
• Example agent workflows utilizing these tools for outbound notifications.

Additional Notes

• Follow DelReact tool system architecture and best practices.
• Consider extensibility for additional notification channels in the future.

[ans-4175]

Hi @karindralinux I think I'm gonna grab this