feat(session): add session middleware with Redis storage support

- Implemented SessionMiddleware with cookie-based session key management
- Added support for encrypted and signed session cookies
- Integrated Redis backend for session state persistence
- Implemented session lifecycle management (create, update, delete)
- Added TTL extension policies for session timeout handling
- Created fluent builder for session middleware configuration
- Implemented cookie security features (secure, http-only, same-site)
- Added session state loading and persistence logic
- Implemented proper error handling and logging for session operations
- Added support for configurable session cookie parameters
- Implemented session key extraction and validation from requests

session/storage/redis.rs

@@ -21,9 +21,7 @@ impl SessionStore for RedisSessionStore {
         let mut conn = self.redis.get_connection()?;
         let value: Option<String> = redis::cmd("GET")
             .arg(session_key.as_ref())
-            .query(&mut *conn.inner_mut())
-            .ok()
-            .flatten();
+            .query(&mut *conn.inner_mut())?;
 
         match value {
             None => Ok(None),