ffi: implement Display for TransactionEffectsV1

[Thoralf-M]

Fixes #223

Effects: TransactionEffectsV1(status=SUCCESS, epoch=45, gas_used=computation_cost: 1000000, storage_cost: 1960800, storage_rebate: 980400, non_refundable_storage_fee: 0, tx_digest=9DbczctN5rvKhju5EimvmGmZKVt4duunxSUx6it5DTen, gas_object_index=Some(0), events_digest=-, dependencies=[HmsaSpgAhniyW3sUjzs1vjo7qoGvDn6ELeYfpihfNngs], lamport_version=11, changed_objects=[ChangedObject(object_id=0x088b04480d6a4bb082de2841f1ccdc4a37a666ee02b6cb4889278e13ea6b2820), ChangedObject(object_id=0xb59d9312afef4c08d09f4a0b0ec696fd57c5b9c9a74fccd455abb2ed9f6fbcc5)], unchanged_shared_objects=[], auxiliary_data_digest=-)