OPA: Make principal name to LDAP configurable #145

Currently we generate the principal names out of deployment and namespace ( essentially the service name ) which works fine in single cluster environments.

If you want to create the same deployments for different environments ( dev, staging ) the principal names wouldn't change as the svc are the same.
This will fail in in average LDAP settings and thus we might want to be able to configure the principal name.

The problematic is, that the principals need to be unique. Maybe like sAMAccountName just a prefix or suffix.

Docs: https://docs.stackable.tech/home/stable/opa/usage-guide/user-info-fetcher/#backend-activedirectory

Issue にリンクされている OPA user-info-fetcher の Active Directory セクションから始め、principal 名がどのように生成されるか、また operator の設定がどこで定義されているかを追跡します。異なる環境の deployment で異なる principal 名を設定でき、LDAP に対する一意性を維持できれば完了です。