feat: Messages API Updates (March 2026)

[superchilled]

This PR makes a number of updates to parts of the Messages API implementation, specifically for the SMS, MMS, MMS, RCS, and WhatsApp channels.

SMS

• Implements the pool_id and trusted_recipient parameters

MMS

• Implements the trusted_recipient parameter
• Adds data models for MmsText, MmsFile, and MmsContent, as well as other models and enums necessary to support these types

RCS

• Implements the trusted_recipient parameter
• Updates the RcsText data model to support suggestions
• Adds data models for all suggestion types
• Adds data models for RcsCard, RcsCardMessage, RcsCarousel, and RcsCarouselMessage
• Add/updates other models and enums necessary to support these new/updated data models

WhatsApp

• Adds the ReplyingIndicatorText data model and updates the mark_whatsapp_message_read function to support it.

Additional Notes

• Adds unit tests to cover the above changes
• Updates __init__.py to include all new models

[superchilled]

Warning

WIP. DO NOT MERGE.

Note

Ready for review.