sgl-router: experimental Rust HTTP router for SGLang worker pools (#25851)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

experimental/sgl-router/tests/component/policies/mod.rs

@@ -0,0 +1,11 @@
+// SPDX-FileCopyrightText: Copyright (c) 2026 The SGLang Authors
+// SPDX-License-Identifier: Apache-2.0
+
+mod zmq_helpers;
+
+mod cache_aware_zmq;
+mod kv_events_hash_parity;
+mod kv_events_tree_concurrent;
+mod kv_events_two_subscribers;
+mod power_of_two;
+mod round_robin;