Created HTTUtils Package (and added HTTPatternBank)
requested to merge atlas-tdaq-ph2upgrades/atlas-tdaq-htt/tdaq-htt-offline/athena:user/rixu/21.0-RefactorCachedAMBank into 21.0
Create the HTTUtils package, moving at first HTTSetup to it. Also added an HTTPatternBank class and a class to read/write the bank from files (this writer class should probably belong in TrigHTTAlgorithms instead of TrigHTTObjects).