beginTransaction method
Begins a transaction https://www.arangodb.com/docs/stable/http/transaction-stream-transaction.html#begin-a-transaction
Implementation
Future<TransactionResponse> beginTransaction(
TransactionOptions options) async {
var data = _getTransactionOptionsData(options);
final answer =
await _httpPost(['_db', db, '_api', 'transaction', 'begin'], data)
as Map<String, dynamic>;
final ret = _toTransactionResponse(answer);
return ret;
}