[CSE-214] Extract `addressSetByTxs`
[CSE-214] Extract `addressSetByTxs`

to have a `pure` part of `addrsTouchedByTx` needed by tests

input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl