Improve Infinispan module compatibility with older releases

Infinispan 7 moved a bunch of classes from the org.infinispan:infinispan-core maven module into the org.infinispan:infinispan-commons module (which, itself, was introduced in Infinispan 6), which can cause user deployments that previously depended on org.infinispan to fail with mysterious NoClassDefFoundErrors if the org.infinispan.commons module was not also previously declared as a deployment dependency.
I suggest we either:
1. Export org.infinispan.commons from the org.infinispan module
2. Rename org.infinispan to org.infinispan.core, and create a new org.infinispan that exports both org.infinispan.core and org.infinispan.commons.