Transfer Positions

Transfers multiple positions from one subaccount to another, owned by the same wallet.

The transfer is executed as a an RFQ. A mock RFQ is first created from the taker parameters, followed by a maker quote and a taker execute.
The leg amounts, prices and instrument name must be the same in both param payloads.
Fee is not charged and a zero max_fee must be signed.
Every leg in the transfer must be a position reduction for either maker or taker (or both).

History: for position transfer history, use the private/get_trade_history RPC (not private/get_erc20_transfer_history).
Required minimum session key permission level is admin