Sage-utils

Breaking changes:
- Updated field names according to the [protocol definition](https://github.com/OpenMatchmaking/documentation/blob/master/docs/protocol.md)

Features:
- Implemented sending the message with retries and timeouts

Fixes:
- Added re-import BaseRegisterWorker class in `__init__.py`

Features:
- Implemented microservice register worker

Features:
- Added classmethod decorators for `from_error` and `with_content` methods

Fixes:
- Updated the default correlation_id value in RpcAmqpClient

Features:
- Implemented `Response` class
- Implemented `BaseExtensions` class
- Implemented `AmqpWorker` and `AmqpExtension` classes