Implemented ByteStream converter for xAOD::EventInfo and dropped the old EventInfo converter

Vakhtang Tsulaiarequested to merge
tsulaia/athena:master-xAODEventInfo-BsCnv into master

Given the new EventInfo is an xAOD object, it requires two converters: one for the interface object and one for the Aux store. The names of new converters are: EventInfoByteStreamxAODCnv and EventInfoByteStreamAuxCnv

Tag @rbielski

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