tests: add return_funds to oasis.ros

[pro-wh]

we've received a draft of this from our partner, which was testing on the testnet

// Portions of this are modeled after Rosetta's Ethereum transfer test, which
// also uses an accounts based model.
// https://github.com/coinbase/rosetta-ethereum/blob/master/rosetta-cli-conf/testnet/ethereum.ros

create_account(1){
  create{
    key = generate_key({"curve_type": "edwards25519"});
    account = derive({
      "network_identifier": {
        "blockchain": "Oasis",
        "network": "5ba68bc5e01e06f755c4c044dd11ec508e4c17f1faf40c0e67874388437a9e55"
      },
      "public_key": {{key.public_key}}
    });

    save_account({
      "account_identifier": {{account.account_identifier}},
      "keypair": {{key}}
    });
  }
}

transfer(10){
  transfer{
    transfer.network = {
      "blockchain": "Oasis",
      "network": "5ba68bc5e01e06f755c4c044dd11ec508e4c17f1faf40c0e67874388437a9e55"
    };
    fee_accumulator = {
      "address": "oasis1qqnv3peudzvekhulf8v3ht29z4cthkhy7gkxmph5"
    };
    currency = {"symbol": "ROSE", "decimals": 9};
    sender = find_balance({
      "minimum_balance": {"value": "101", "currency": {{currency}}}
    });

    amount_fee = "100";
    sender_amount_fee = 0 - {{amount_fee}};
    available_amount = {{sender.balance.value}} - {{amount_fee}};
    recipient_amount = random_number({"minimum": "1", "maximum": {{available_amount}}});
    print_message({"recipient_amount": {{recipient_amount}}});

    sender_amount = 0 - {{recipient_amount}};
    recipient = find_balance({
      "not_account_identifier": [{{sender.account_identifier}}],
      "minimum_balance": {"value": "0", "currency": {{currency}}},
      "create_limit": 100,
      "create_probability": 50
    });
    transfer.confirmation_depth = "1";
    transfer.operations = [{
      "operation_identifier": {"index": 0},
      "type": "Transfer",
      "account": {{sender.account_identifier}},
      "amount": {"value": {{sender_amount_fee}}, "currency": {{currency}}}
    },
    {
      "operation_identifier": {"index": 1},
      "type": "Transfer",
      "account": {{fee_accumulator}},
      "amount": {"value": {{amount_fee}}, "currency": {{currency}}}
    },
    {
      "operation_identifier": {"index": 2},
      "type": "Transfer",
      "account": {{sender.account_identifier}},
      "amount": {"value": {{sender_amount}}, "currency": {{currency}}}
    },
    {
      "operation_identifier": {"index": 3},
      "type": "Transfer",
      "account": {{recipient.account_identifier}},
      "amount": {"value": {{recipient_amount}}, "currency": {{currency}}}
    }];
  }
}

return_funds(10){
  transfer{
    transfer.network = {
      "blockchain": "Oasis",
      "network": "5ba68bc5e01e06f755c4c044dd11ec508e4c17f1faf40c0e67874388437a9e55"
    };
    fee_accumulator = {
      "address": "oasis1qqnv3peudzvekhulf8v3ht29z4cthkhy7gkxmph5"
    };
    currency = {"symbol": "ROSE", "decimals": 9};
    recipient = find_balance({
      "account_identifier": {"address":"oasis1qpfcr953qggrq6889zczf5rth3xw4qfhhgh4zyhy"},
      "minimum_balance": {"value": "0", "currency": {{currency}}}
    });
    sender = find_balance({
      "minimum_balance": {"value": "101", "currency": {{currency}}},
      "not_account_identifier": [{{recipient.account_identifier}}]
    });

    amount_fee = "100";
    sender_amount_fee = 0 - {{amount_fee}};
    available_amount = {{sender.balance.value}} - {{amount_fee}};
    recipient_amount = random_number({"minimum": "1", "maximum": {{available_amount}}});
    print_message({"recipient_amount": {{recipient_amount}}});
    sender_amount = 0 - {{recipient_amount}};

    transfer.confirmation_depth = "1";
    transfer.operations = [{
      "operation_identifier": {"index": 0},
      "type": "Transfer",
      "account": {{sender.account_identifier}},
      "amount": {"value": {{sender_amount_fee}}, "currency": {{currency}}}
    },
    {
      "operation_identifier": {"index": 1},
      "type": "Transfer",
      "account": {{fee_accumulator}},
      "amount": {"value": {{amount_fee}}, "currency": {{currency}}}
    },
    {
      "operation_identifier": {"index": 2},
      "type": "Transfer",
      "account": {{sender.account_identifier}},
      "amount": {"value": {{sender_amount}}, "currency": {{currency}}}
    },
    {
      "operation_identifier": {"index": 3},
      "type": "Transfer",
      "account": {{recipient.account_identifier}},
      "amount": {"value": {{recipient_amount}}, "currency": {{currency}}}
    }];
  }
}