Description: Available types of account groups.
•ACCOUNT_GROUP_TYPE_UNSPECIFIED = 0
•ACCOUNT_GROUP_TYPE_BORROW_FROM_MASTER = 1
Margin independently (sub accounts can borrow Purchasing Power from master up to configured).
•ACCOUNT_GROUP_TYPE_JOIN_PURCHASING_POWER = 2
Margin independently, then sum margin requirements and Purchasing Powers.
•ACCOUNT_GROUP_TYPE_CO_MARGIN = 3
Margin master and sub-accounts together (combine funds, orders, and positions for margin calculations).