Azure.Messaging.EventHubs.Processor 5.1.0-preview.1

### Acknowledgments Thank you to our developer community members who helped to make the Event Hubs client libraries better with their contributions to this release: - Christopher Scott _([GitHub](https://github.com/christothes))_ - Roman Marusyk _([GitHub](https://github.com/marusyk))_ #### Consuming events - The `EventProcessorClient` has been enhanced to derive from the new `EventProcessor<TPartition>` primitive, bringing improvements to stability, resilience, and performance. #### Publishing events - Event batches are now protected against modification while publishing is actively taking place. #### Bug fixes and foundation - Validation for the Event Hubs fully qualified namespace has been improved, allowing for more deterministic failures when creating clients. - Exceptions surfaced will now properly remember their context in all scenarios; previously, some deferred cases unintentionally reset the context. - Logging for the Storage Manager for Azure Blobs now follows the common pattern for other Event Hubs types, as well as providing additional context and information. - The diagnostic scope for activities will now complete in a more deterministic manner. (A community contribution, courtesy of [christothes]((https://github.com/christothes))) - Diagnostic activities have been extended with additional information about events being processed and with additional environmental context. - Parsing of connection strings is now more permissive for the `Endpoint` key, allowing additional formats that result from common mistakes when building the string rather than copying the value from the portal. - The partition manager has been renamed to `StorageManager` to better represent its purpose. (A community contribution, courtesy of ([marusyk](https://github.com/marusyk)) #### Testing - The tests for load balancing and the Event Processor client have been tuned to remove dependencies on Azure resources and run more efficiently. (A community contribution, courtesy of [christothes](https://github.com/christothes)) https://github.com/Azure/azure-sdk-for-net/blob/f0e5297c8ada03eebd2ca967225312fae644d261/sdk/eventhub/Azure.Messaging.EventHubs.Processor/CHANGELOG.md