add (meaningful) test of LArRawChannelBuilderAlg + configuration
Unlike most tests we have, here we diff only the data (eg LArRawChanels) produced by the component (LArRawChannelBuilderAlg) being tested. No log-file diff'ing. The reference file is a text table of channels, energies, etc. For three evens it's about 230k but compresses well (30kB after standard gzip).