Improve ByteStream handling for DoubleEventSelector

Tadej Novakrequested to merge
tadej/athena:des-bs into master

Improve ByteStream handling for DoubleEventSelector:

  • unify attribute list names to be able to parse them using event loop managers
  • always treat ByteStream as primary input to ensure proper event context generation

/cc @gemmeren @jchapman

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