At this point we will allow to configure batch size by providing VM args / system properties.

E.g.: ./bin/standalone.sh -Daerogear.ios.batch=12500

The name in -Daerogear.<name>.batch will come from VariantType enum name: android, ios, simplePush, windows_wns, windows_mpns.

The implementation will be held by a CDI bean so it will allow us to configure it for tests dynamically.