Use testcontainers for jooq generation setup

[juherr]

To enable it, just add run: mvn -Pdev,testcontainers package

Optionally, all V0 migrations are merged into the same baseline and can be used to avoid the need to grant privileges to the db user (Fix #956).

To enable it, just add run: mvn -Pdev,testcontainers -Ddb.baseline=V1 package

It should help new users to bootstrap the project more easily.

[juherr]

Ping @goekay WDYT?

[juherr]

Try the very new plugin instead https://testcontainers.com/guides/working-with-jooq-flyway-using-testcontainers/

[juherr]

Partially replaced by #1455