EJB timers should use a different logging category to separate it from other EJB invocations

To analyze timer behaviour or track issues related to timers sometimes a log level higher than INFO is needed.
Unfortunately the category "org.jboss.as.ejb3" does not make a differenciation and setting this category to DEBUG or TRACE cause a high amount of log messages, this can have performance impacts and make it dfficult to handle and read the logfiles.

It should be possible to have a separate category for timers.