feat(teams-attachments): added support for teams attachments

[aadamgough]

Description

Added support for teams attachments.

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Ran the tools and saw the attachments there.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• All tests pass locally and in CI (bun run test)
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• I have updated version numbers as needed (if needed)
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

Security Considerations:

• My changes do not introduce any new security vulnerabilities
• I have considered the security implications of my changes

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[greptile-apps]

PR Summary

This PR adds comprehensive support for Microsoft Teams attachments across the platform, enabling attachment handling in both chat and channel contexts.

• New attachment-utils.ts introduces transformAttachment and extractMessageAttachments functions but uses unvalidated any types that should be properly typed
• read_chat.ts and read_channel.ts need error handling for malformed attachment data and validation of attachment URLs for security
• MicrosoftTeamsAttachment interface in types.ts has several optional fields that could benefit from stricter typing
• TeamsMessageSelector component uses channelId for message identification but should validate attachment metadata before display
• Consider adding size limits and content type validation for attachments to prevent potential security issues

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