Add configuration options for logging

**Feature request**
It would be great to have caching for core.

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

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

No file or test is named, and the title mentions logging while the request describes core caching. Start by locating the configuration entry point and core caching code, then confirm the intended scope; done means a documented `enable_caching` option defaults to false and controls caching as requested.

Written by the indexing model from the issue text.