Add JDBC support for non embedded datasources

Jdbc is usable in reactive projects for support workloads such as schema management (Liquibase https://liquibase.jira.com/browse/CORE-3419) or Quartz clustered scheduler.

I am not sure about the purpose of this issue, what would you like to be fixed/supported?

IMO JDBC DSL should provide ability to connect to external (Non-embedded) database. Currently only EmbeddedDataSourceConfigurationInitializer is used in DSL:

spring-fu/kofu/src/main/kotlin/org/springframework/fu/kofu/jdbc/JdbcDsl.kt

Line 45 in d80a9d0

    
           EmbeddedDataSourceConfigurationInitializer(dataSourceProperties).initialize(context)

Other Datasource configurators (like DataSourceConfiguration_GenericInitializer) is present in autoconfigure-adapter subproject but not used in DSLs. Or I am missing something?

Fixed in KoFu via #332, JaFu support will come via #339 in 0.5.0 as well as refined support that we have started to discuss with @aneveu and @fteychene.