Consider deprecating old parsers API

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

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

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

The issue does not name files, tests, or an entry point. First clarify whether the intended work is deprecating the old parsers API or adding API caching; then identify the relevant configuration and API locations, define the caching behavior and deprecation scope, and document tests that demonstrate the chosen change is complete.

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