* fix(examples): comment out stop.sh to avoid error when script is missing
* feat: add file_store support for cache manager
* [fix] fix multi gpu transfer
* [fix] fix global kvcache transfer
* [Feature] [KVCache] support file_store kv cache backend
* chore: update FileStore according to PR comments
* fix: remove comments
* fix: add swap_cache_layout for file store
* fix: remove rank key
* fix: Switch KV cache storage to pure file mode
* Temporarily disable support for Tensor types
* fix: remove args --kvcache_file_path & add envs FILE_BACKEND_STORAGE_DIR
* fixx: Simplify cache_transfer_manager.py
* fix: fix syntax bug
* fix: Simplify file_store.py
* fix: Use the key directly as the filename
* fix: Simplify set()
* fix: Simplify cache_transfer_manager.py & file_store.py
* fix: Only support load to cpu buffer
* feat: add FileStore backend for cache transfer
* fix: guard zmq import