[Router] Add bucket-aware policy domains and native cache indexing (#38108)

Signed-off-by: Vincent Gao <vincentbo@linux.alibaba.com>
Co-authored-by: inkcherry <mingzhi.liu@amd.com>
Co-authored-by: yangbodong22011 <13137470+yangbodong22011@users.noreply.github.com>

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

@@ -3,7 +3,9 @@
 
 mod zmq_helpers;
 
-mod cache_aware_zmq;
+mod bucket_domains;
+mod cache_prefix_provider;
+mod decode;
 mod fused_score;
 mod kv_events_hash_parity;
 mod kv_events_tree_concurrent;