Add Teams integration

[Djiit]

This issue is to add Microsoft Teams integration support to gong.

Overview

The Teams integration should allow sending notifications to Microsoft Teams channels about pending PR reviews.

Implementation Details

1. Create a new package in internal/integrations/teams
2. Implement the Teams integration interface
3. Add support for Teams webhook URLs
4. Add configuration parameters for Teams notifications

Acceptance Criteria

• Teams notifications can be configured globally or per rule
• Teams integration can be used alongside other integrations (Slack, Comment, etc.)
• The integration is properly documented in the docs
• Unit tests are written for the implementation
• Update examples in configuration documentation

References

See existing integrations like Slack integration for a good example to follow.

Labels: integration, help wanted