FEAT: Add ordered and unordered list formatting with auto-continuation in Rocket Chat message composer

Description

Add ordered and unordered list formatting tools to the message composer, similar to modern text editors like Notion and Slack. This will improve user experience by eliminating the need to manually type list markers.

Problem

Currently, users must manually type list markers (1., 2., -, etc.) when creating lists in messages. This is tedious and breaks the flow of writing, especially for longer lists.

User Experience Benefits

• Faster list creation
• Consistent formatting across all messages
• Familiar behavior matching Notion, Slack, Discord
• Reduced cognitive load (no manual numbering)

Proof of concept

https://github.com/user-attachments/assets/c529fe17-e4d7-45d5-ad3f-7f64d4cabfac

Note-

This aligns with industry standards and will significantly improve the writing experience for users creating structured content in messages.
I would like to implement this feature by contributing a PR that resolves this implementation. I'd appreciate feedback from the Rocket.Chat team on this feature proposal and the suggested implementation approach before I begin work.

Start by locating Rocket.Chat’s message composer implementation and review the linked proof of concept for the intended behavior. Define the scope for ordered and unordered list formatting, including auto-continuation, and consider the issue complete when both list types work consistently in message composition.