auto-update some computed fields in DB

[Sheraff]

For example, for the "likes counter" that are owned as a boolean by Track, but also incremented as a number for Album and Artist

• we could look into postgre trigger to automate this increment
• we could look into prisma "middleware"

If that works fine, we could also look into have similar fields on Genre, to avoid the complicated requests we have to make at query time

• likes
• listens
• has tracks (in itself or its children)