[feature request] Add mysql in the default provisioners

[mathieu-benoit]

In addition to redis and postgres, and like in score-compose it would be great to have mysql supported in the default provisioners of score-k8s init.

I know we have this disclaimer about the current small list of default provisioners, but it will greatly simplify and accelerate the adoption as mysql is a very popular use case.

Example with: https://github.com/humanitec-architecture/backstage/blob/main/templates/node-service/content/score.yaml#L36

[mathieu-benoit]

Something around this for example: https://github.com/humanitec-architecture/resource-packs-in-cluster/blob/main/humanitec-resource-defs/mysql/basic/main.tf