Support Global Transaction event handlers.

[erkieh]

Feature description

It seems that currently it is not possible to register global Transaction before commit event listeners in Micronaut 4. Please add the capability.

I was able to provide my own DataSourceTransactionManager in Micronaut 3 by extending the default one, but this cannot be done in Micronaut 3 anymore since the class is final. Providing my own AbstractDefaultTransactionOperations did not fully work for me also since calls to a TransactionalEventListener annotated method did not fire after the transaction was commited.