feat: add a soundboard

- [ ] find an open source set of quick sounds (thunder, scream, door open, door shut, battle, explosion...)
- [ ] upload everything on the server
- [ ] backup it somewhere
- [ ] create a default TrackCollection: `Default sounds`, tag them all with `sound` or `effect`
- [ ] add UI for triggering these sounds
- [ ] find a way to play them in the PlayerUI (warning: what about the autoplay security?)
- [ ] for now, allow having 1 collection in a Session that will be sound effects, by default the `Default sounds` of 6-9 tracks