Function parse_account_state 

pub fn parse_account_state(
    subaccount: &DydxSubaccountInfo,
    account_id: AccountId,
    instruments: &HashMap<InstrumentId, InstrumentAny>,
    oracle_prices: &HashMap<InstrumentId, Decimal>,
    ts_event: UnixNanos,
    ts_init: UnixNanos,
) -> Result<AccountState>

Parse a dYdX subaccount info into a Nautilus AccountState.

dYdX provides account-level balances with:

• equity: Total account value (total balance)
• freeCollateral: Available for new orders (free balance)
• locked: equity - freeCollateral (calculated)

Margin calculations per position:

• initial_margin = margin_init * abs(position_size) * oracle_price
• maintenance_margin = margin_maint * abs(position_size) * oracle_price

Errors

Returns an error if balance fields cannot be parsed.