#5067 Refactor PaperTradeExchange to use the BudgetChecker when simulating order fills

• MarketConfig was replaced by BudgetChecker for fee calculation and portfolio constraints checks

• Currently fees are calculated directly in the PaperTradeExchange class where also budget checks take place. The implementation is incomplete, for certain orders fees are not calculated at all, and for all cases, fee asset is fixed and assumed to be the same for all exchanges, which is not true. BudgetChecker provides a comprehensive solution for all these issues, it calculates all fees, checks budget constraints and retrieves the correct fee asset from exchanges. As a result, the simulated trading by the PaperTradeExchange will become more accurate.

Link: https://github.com/hummingbot/hummingbot/pull/5067