refactor(lock): restructure lock crate, remove unused modules and clarify directory layout

- Remove unused core/rwlock.rs and manager/ modules (ManagerFactory, LifecycleManager, NamespaceManager)
- Move all lock-related code into crates/lock/src with clear submodules: client, core, utils, etc.
- Ensure only necessary files and APIs are exposed, improve maintainability
- No functional logic change, pure structure and cleanup refactor

Signed-off-by: dandan <dandan@dandandeMac-Studio.local>

crates/lock/Cargo.toml

@@ -38,4 +38,8 @@ tokio.workspace = true
 tonic.workspace = true
 tracing.workspace = true
 url.workspace = true
-uuid.workspace = true
+uuid.workspace = true
+thiserror.workspace = true
+once_cell.workspace = true
+lru.workspace = true
+dashmap.workspace = true