feat: Add HTTP CONNECT proxy support (http_connect_proxy=)#2990
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Adds http_connect_proxy= parameter to KafkaConsumer, KafkaProducer, and KafkaAdminClient. Accepts a plain proxy URL string (e.g. http://proxy:8080), mirroring the existing socks5_proxy= convention. Implemented as HttpConnectWrapper in kafka/http_connect_wrapper.py — a non-blocking state machine (DISCONNECTED → CONNECTING → SENDING → READING → COMPLETE) that satisfies the same three-method contract as Socks5Wrapper: use_remote_lookup, socket, connect_ex. Broker hostnames are always forwarded unresolved so the proxy handles DNS from inside the network. Proxy authentication and TLS-to-proxy (https://) are deferred to a follow-up. Also adds kafka/net/__init__.py to fix a packaging bug where setuptools (namespaces=false) would not include kafka.net as an installable package.
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Adds
http_connect_proxy=toKafkaConsumer,KafkaProducer, andKafkaAdminClient.HttpConnectWrapperinkafka/http_connect_wrapper.pyimplements this as a non-blocking state machine satisfying the same three-method contract asSocks5Wrapper:use_remote_lookup,socket,connect_ex.Also adds
kafka/net/__init__.pyto fix a packaging bug:pyproject.tomlsetsnamespaces = false, so setuptools only includes subdirectories with__init__.py. Without it,kafka.netis silently excluded from installed wheels.Tests: