Buffered ordered message stream

[wbjohnston]

closes #90 #75

Ref #88

Changes

1. [matchbook-util] feat: add message_sequencer_stream, a stream that will buffer incoming messages until it receives the next message it expects, as determined by the topic_id and topic_sequence_n. When this stream receives a message out of order, it will buffer it and re-request all missing messages. When it receives all of the messages it requires to continue, it will emit all buffered messages until it can't anymore.
2. [port] feat: messages are guaranteed to be processed in order now.
3. [port] feat: messages will be re-requested if the port cannot continue to process messages.

TODO

1. Front event stream in matching-engine
2. clean up random additions to docker compose
3. Add message_sequencer_stream doc string