[pallet-revive] implement tx origin API (#6105)
Implement a syscall to retreive the transaction origin. --------- Signed-off-by: Cyrill Leutwiler <[email protected]> Signed-off-by: xermicus <[email protected]> Co-authored-by: GitHub Action <[email protected]> Co-authored-by: command-bot <> Co-authored-by: Alexander Theißen <[email protected]>