Add TypeScript types for routes

**Feature request**
It would be great to have monitoring for handlers.

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

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

Start by reconciling the title about TypeScript route types with the body’s request for handler monitoring, then locate the project’s configuration handling and handler entry points. Done should be defined as a new enable_monitoring option with a false default and monitoring behavior for handlers, but the issue does not name files or tests.

Written by the indexing model from the issue text.