Refactor handlers for better readability

**Feature request**
It would be great to have timeout for parsers.

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

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

No files, tests, or entry points are named. Start by locating parser handling and configuration loading, then trace how parser execution can be bounded. Done means an `enable_timeout` option defaults to `false`, enables parser timeouts when set, and has coverage for both settings.

Written by the indexing model from the issue text.