feat: #49 Handle redeemers as map in Conway era

[satran004]

• Add implementation to handle redeemers as map in Conway era
• Unit tests

; Flat Array support is included for backwards compatibility and will be removed in the next era.
; It is recommended for tools to adopt using a Map instead of Array going forward.
redeemers =
  [ + [ tag: redeemer_tag, index: uint, data: plutus_data, ex_units: ex_units ] ]
  / { + [ tag: redeemer_tag, index: uint ] => [ data: plutus_data, ex_units: ex_units ] }