fix: missing TLS feature gates

Adds missing cfg(tls) annotations to code blocks that require it,
allowing cargo check --all-targets to pass.

Author: domodwyer

src/connection.rs

@@ -620,7 +620,7 @@ mod tests {
 
         async fn connect(
             &self,
-            _tls_config: Option<Arc<rustls::ClientConfig>>,
+            _tls_config: TlsConfig,
             _socks5_proxy: Option<String>,
             _max_message_size: usize,
         ) -> Result<Arc<Self::R>> {

tests/client.rs

@@ -73,6 +73,7 @@ async fn test_topic_crud() {
 // Disabled as currently no TLS integration tests
 #[ignore]
 #[tokio::test]
+#[cfg(feature = "transport-tls")]
 async fn test_tls() {
     maybe_start_logging();