Change group of grails-datamapping-async

[jdaugherty]

Issue description

grails-datamapping-async is meant to be used externally and included by libraries. This ticket is to add a forge feature for async & change the group so that it's just org.apache.grails

[sanjana2505006]

@jdaugherty
I’ve addressed this by updating the group ID for grails-datamapping-async to org.apache.grails in its build configuration.

I’ve also introduced a new async feature in Grails Forge (including a test case) to make the dependency easily discoverable for new projects. Additionally, I updated the migration script and documentation to reflect the new coordinates. All changes have been verified with a local build.
I’ve raised PR #15342 for this. Please let me know if you have any feedback or would like any changes I’d be happy to update it.

[jdaugherty]

@sanjana2505006 This ticket is scheduled for 8.0.0-M1 and this is considered a breaking change. More than just changing the group needs to happen to complete this ticket.