List transactions

[ssoper]

• Consume transaction model
• List most recent 50 transactions
• Implement date querying
• Implement varying count
• Implement sort

// Last 50 transactions
accountSrvc.listTransactions(it)?.let {
  println(it)
}

// Transactions between 10/1/2020 and 10/3/2020
val startDate = GregorianCalendar(2020, 9, 1)
val endDate = GregorianCalendar(2020, 9, 3)
accountSrvc.listTransactions(it, startDate, endDate)?.let {
  println(it)
}

// Retrieve 5 most recent transactions
accountSrvc.listTransactions(accountIdKey, null, null, TransactionSortOrder.DESC, null, 5)?.let {
  println(it)
}