feat(client): add margin capital flow and interest history endpoints

[carlosmiei]

• continues https://github.com/ccxt/binance-api-node/pull/660/files

[Copilot]

Pull Request Overview

This PR adds four new margin trading endpoints to the Binance API client: capital flow tracking, interest history, isolated margin pair information, and isolated margin account details. These additions extend the existing margin trading functionality.

Key Changes:

• Added marginCapitalFlow and marginInterestHistory endpoints for tracking margin account activity
• Added isolatedMarginAllPairs and isolatedMarginAccount endpoints for isolated margin operations

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