grails-quartz: database-migration plugin support

Currently, it seems one needs to create the quartz tables manually when using `jdbcStore = true`. It would be great if the plugin supports database-migration, to create the quartz table migrations automatically with `dbm-gorm-diff`, like the database-migration plugin does itself to create the liquibase tables.

Start by tracing grails-quartz's jdbcStore=true path and the database-migration plugin's dbm-gorm-diff entry point. Compare this with how the database-migration plugin creates its Liquibase tables. Done means Quartz table migrations are generated automatically, removing the need for manual table creation.

Written by the indexing model from the issue text.