Support Agroal pool (JakartaEE 9+)

[grgrzybek]

At some point, while JDBC is not jakartified, we'll have to move to JakartaEE version of JTA.

https://github.com/agroal/agroal

cc: @graben (I saw your snowdrop/narayana-spring-boot#99) ;) - just for your information. I can't say at all when I'll work on this, but the work is already slowly progressing on Pax Web, so Pax JDBC should be next.

[graben]

@grgrzybek : What about transx?

[grgrzybek]

Pax Transx too of course ;)