Broker API: Trading - Trading Account Configuration

[drew887]

Implement the routes from the docs here

Also missing from the docs is a GET route for /v1/trading/accounts/{account_id}/account/configurations that we should implement here

Should add the following interface to BrokerClient:

  def get_trade_configuration_for_account(
          self,
          account_id: Union[UUID, str]
  ): -> TradeAccountConfiguration:
      pass

  def update_trade_configuration_for_account(
          self,
          account_id: Union[UUID, str],
          config: UpdateTradeConfigurationRequest
  )-> TradeAccountConfiguration:
      pass