Repair auction functionality for order book

[cjdsellers]

During the port of the OrderBook and associated components to Rust, the auction functionality was "commented out" to make the transition simpler.

We now need to "repair" and reinstate this functionality. It should be possible for this to become a component which the Rust OrderBook can directly interface with, this can be discussed in more detail.

Note the default_auction_match commented here:
https://github.com/nautechsystems/nautilus_trader/blob/develop/nautilus_trader/backtest/matching_engine.pyx#L20

The entire function has been commented out here:
https://github.com/nautechsystems/nautilus_trader/blob/develop/nautilus_trader/backtest/auction.py