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Integration of all external packages into MassTransit, split out into Abstractions, Middleware, and the core MassTransit assembly.
Refactoring rider producers
Allow multiple configurations for send pipe in Riders
Cancel Pending checkpoints as we won't send them to consumer. Tests Cleanup. Improve ReceiveContext
Fixed #4345 - discard skipped/faulted messages for Kafka/Event Hub
Replace ReceiverConfiguration with ReceiveEndpointConfiguration for Riders
Adding usage telemetry reporting, to track feature usage