Add Kafka Gateway transport plugin - #7
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Implements request/reply over Apache Kafka (librdkafka) with correlation-id, matching rabbitmq/servicebus plugin contracts. Includes CMake FetchContent/vcpkg build, Docker Compose for local broker, and smoke test.
Align kafka and servicebus with rabbitmq: nlohmann/json and transport libraries come from FetchContent. Remove vcpkg.json manifests and toolchain-based docs.
Include kafka in the shared plugin release matrix (FetchContent build, no vcpkg). Add samples/kafka with docker-compose (broker+UI) and gateway/client plugin config files.
Updated docker-compose.yml to improve local Kafka setup: added Kafka UI (provectuslabs/kafka-ui) on port 8080, improved listener configuration, updated environment variables, and renamed Kafka container to graftcode-kafka. Added three example JSON config files for KafkaPlugin usage in .NET Core plugins, client, and gateway components.
Azure SDK FetchContent build was failing configure with missing CURL. Enable BUILD_TRANSPORT_WINHTTP on Windows and CURL only on Unix.
Keep kafka in release.yml; put servicebus back on vcpkg toolchain.
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Summary
kafka/Graftcode Gateway transport plugin (librdkafka request/reply withcorrelation-id/reply-to)IServer/ITransport+ factory exportsTest plan
cmake -S kafka -B kafka/build && cmake --build kafka/buildctest --test-dir kafka/builddocker compose -f kafka/docker-compose.yml up -d+kafka/scripts/create-topics.shggwithkafka/pluginConfig.json