jboss-transaction-api_1.2_spec jar needed in JWS' Tomcat /lib directory

See https://github.com/web-servers/narayana-tomcat#transactions-api-jar-and-jws-976

Even if user packages Narayana in the war file, it is still necessary to copy Transactions API jar to the Tomcat's /lib directory so as Tomcat DBCP2 works with TransactionalDataSourceFactory.java without classloader issues.

We have to design a way to resolve this PITA for users. Could we simply start shipping the API jar in JWS distro? Given it does not change frequently anyway I suppose... Do something with the listener and classlaoding? Ideas?