Add soundboard sounds

[freya022]

Pull Request Etiquette

• [X] I have checked the PRs for upcoming features/bug fixes.
• [X] I have read the contributing guidelines.

Changes

• [X] Internal code
• [X] Library interface (affecting end-user code)
• [ ] Documentation
• [ ] Other: _____

Closes Issue: NaN

Description

Implements https://discord.com/developers/docs/change-log#soundboard-api

Also supports create/delete/update via gateway