Add configuration options for caching

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

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

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

Start by locating the repository's configuration entry points and tracing how existing options are defined and consumed. The issue does not name files, tests, or the cache behavior, so clarify the cache scope and invalidation expectations before implementing; done should include an `enable_caching` option whose default is `false`.

Written by the indexing model from the issue text.