Crypto futures margin call account for quote currency

[jhonabreul]

Expected Behavior

Margin call models for crypto future should account for the collateral currency only. For instance, in Binance, margin is calculated separately for each currency available.

Also, we need lean to be able to model margin as crypto exchanges do. There is a difference between the used/available margin and the maintenance margin.

In Binance and Bybit, for instance, the initial margin requirement is the position's used margin and it's deducted from the available margin. The maintenance margin is account wise and has nothing to do with margin used/available.

This is following #9235

Actual Behavior

The default margin call model accounts for the whole portfolio value. See the CryptoFutureMarginModel initial margin calculations.

And Lean uses the maintenance margin to calculate used and remaining margin, which is not accurate for crypto futures.

Potential Solution

Reproducing the Problem

System Information

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