thehouseisonfire / rumqtt / 29870636306

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feat(rumqttc): add SOCKS5 proxy support and refactor proxy API

Replace the public-field Proxy, ProxyType, and ProxyAuth configuration
structs with a builder-style API: Proxy::http(...), Proxy::https(...),
Proxy::socks5(...), and .with_credentials(...). This is a breaking change
for existing proxy users.

Split the monolithic "proxy" Cargo feature into "http-proxy" and
"socks-proxy", keeping "proxy" as a compatibility umbrella that enables
both. SOCKS5 support uses tokio-socks with proxy-side DNS resolution
and RFC 1929 username/password authentication.

Key changes:
- Add SOCKS5 proxy implementation in rumqttc-core/src/proxy.rs with
  tokio-socks, including connect handshake unit tests
- Add socks5_proxy example for v4 and v5 crates
- Redact passwords in Proxy Debug output
- Handle IPv6 proxy host addresses correctly
- Update docs: CHANGELOG, MIGRATION guide, proxies recipe, brokers
  recipe, and feature matrix
- Add proxy-related integration tests for both v4 and v5 event loops

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