Enable JAX persistent caching via EconPizzaConfig class

[shtopane]

• Expose a configuration object to the end user with the option to enable persistent caching via JAX.
• By default, the folder where the JAX files reside is called __jax_cache__ and is created in the user's working directory. This can be changed by the option jax_cache_folder.

Usage:

import econpizza as ep
ep.config.update("enable_jax_persistent_cache", True)

Optionally, change the name or destination of the caching folder:

import econpizza as ep
ep.config.update("jax_cache_folder", "example_folder")
ep.config.update("enable_jax_persistent_cache", True)

[gboehl]

Perfect! Could you cleanup the commit history a bit? It should be sufficient to have all this as one commit. I'd use git rebase interactively for that.

[shtopane]

Okay, something messed up, I'll close this one and open another