[SPIKE] JustSaying message ingestion and retry

[ngallegos]

Results from https://github.com/Particular/Vision/issues/605

Completed:

• Added incoming and outgoing message translation from/to JustSaying message format
• Added multiple error queue support and discoverability

Started, but not complete:

• JustSaying IMessageMonitor implementation to report failure information to ServiceControl
• JustSaying middleware implementation to acknowledge retries to ServiceControl
• ServiceControl api for receiving failure and retry acknowledgments
• ServiceControl support for storing and reconciling failure information with messages in the error queue

Note

The message translation was done in the SQS Transport and surfaced here through git submodules. If you want to run the spike yourself, you'll need to run the following commands in the repository root after pulling the source code:

> git submodule init
> git submodule update --recursive