fix: getmessagetype to ensure stanza consistency with whatsapp

[gusquadri]

Some types of messages were missing, for example reactions were sent as 'text'.

[whiskeysockets-bot]

Thanks for opening this pull request and contributing to the project!

The next step is for the maintainers to review your changes. If everything looks good, it will be approved and merged into the main branch.

In the meantime, anyone in the community is encouraged to test this pull request and provide feedback.

✅ How to confirm it works

If you’ve tested this PR, please comment below with:

Tested and working ✅

This helps us speed up the review and merge process.

📦 To test this PR locally:

# NPM
npm install @whiskeysockets/baileys@gusquadri/Baileys#fix-getmessagetype

# Yarn (v2+)
yarn add @whiskeysockets/baileys@gusquadri/Baileys#fix-getmessagetype

# PNPM
pnpm add @whiskeysockets/baileys@gusquadri/Baileys#fix-getmessagetype

If you encounter any issues or have feedback, feel free to comment as well.

[purpshell]

🙏