develop
Integration of all external packages into MassTransit, split out into Abstractions, Middleware, and the core MassTransit assembly.
Fixed in-memory outbox telemetry to capture ExecutionContext, which should properly flow activity traces
Add the ability to delay execute of the next routing slip activity, as well as a new callback for setting variables, setting the delay.
Cleanup using
Working on an inbox/outbox implementation for Entity Framework Core, InMemory, and ultimately additional transaction-based storage engines