Improve auth performance

**Feature request**
It would be great to have serialization for hooks.

**Use case**
Many users need this functionality for production deployments.

**Implementation idea**
Add a new config option `enable_serialization` with default `false`.

Start by locating the hook handling and configuration parsing in the Shell codebase, then trace how hooks are used during authentication. Confirm how a new enable_serialization option should default to false and define what serialized hooks must do in production deployments. Done means the option works without changing default behavior and the relevant behavior is verified.

Written by the indexing model from the issue text.