Change BuyingPowerModel for CryptoFuture in dYdX

[AdalyatNazirov]

Support USDC collateral in dYdX brokerage

Description

Related Issue

Relates #8904

Motivation and Context

dYDX uses USDC as collateral and Account Currency, but quote currency is USD for all perp instruments

Requires Documentation Change

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Refactor (non-breaking change which improves implementation)
• Performance (non-breaking change which improves performance. Please add associated performance test and results)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Non-functional change (xml comments/documentation/etc)

Checklist:

• My code follows the code style of this project.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My branch follows the naming convention bug-<issue#>-<description> or feature-<issue#>-<description>