Decide whether we should make the internal LRA client API not auto closable

The LRA implementation contains an internal client API called io.narayana.lra.client.NarayanaLRAClient which implements java.io.Closeable. A recent PR (see issue https://issues.jboss.org/browse/JBTM-3212) made the implementation of the close method a NOOP (since there is no longer any need for cleanup actions). But the method was left empty since there is a possibility that is will be needed in LRA version 1.x where a LRA client API will be added and since there are existing users of the client API.

This task is a reminder to revisit the decision to remove java.io.Closeable prior to releasing an implementation of version 1.0 of the LRA specification.