* Enable Kafka Worker Factory and Refactor Worker Implementation
Introduce a flexible worker factory mechanism allowing custom worker creation with DefaultWorkerFactory as the initial implementation. Enhance Worker class to be generic, remove manual consumer configuration, and streamline message processing logic, improving code maintainability and extensibility.
* Refactor Kafka configuration properties
Renamed configuration properties in Consumer and Producer entities. Updated references in the codebase to use the new `Config` property instead of `ConsumerConfig` and `BootstrapServers`. Adjusted appsettings.json to match the new configuration schema.
* Add Kafka producer and consumer implementation
Implemented classes and interfaces to handle Kafka producers and consumers, including `ProducerProxy`, `ConsumerProxy`, and related context classes and factories. Refactored existing code to utilize these new implementations, replacing worker terminology with consumer and addressing context-specific fields.
* Remove redundant code in DefaultConsumerFactory and SendMessage
Removed commented-out unused return statement in DefaultConsumerFactory. Also eliminated explicit producer.Dispose() call in SendMessage, as the 'using' statement already handles resource cleanup.
* Add ExpandoObject producer and consumer factories
Replaced DefaultSerializers with new JsonSerializer and JsonDeserializer classes. Introduced ExpandoObjectProducerFactory and ExpandoObjectConsumerFactory to handle dynamic types. Updated workflow and configuration to use the new factories.
* Refactor bookmark processing and manage worker subscriptions
Refactored bookmark processing logic to utilize extension methods. Optimized worker subscriptions by centralizing topic subscription management and added logging for subscribed topics. This improves maintainability and clarity of the codebase.
* Refactor worker creation to use ActivatorUtilities
Updated WorkerManager to instantiate workers using ActivatorUtilities for better dependency injection support. This enhances code readability and maintains consistency with the service provider approach used throughout the codebase.
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