[Cache] add SodiumMarshaller

[nicolas-grekas]

Q	A
Feature PR	symfony/symfony#35019
PR author(s)	@atailouloute
Merged in	5.1-dev

[pableu]

I figured out how to use this and how to generate a key, and I think could document it.

Where would we add the documentation? Directly in https://symfony.com/doc/current/cache.html? Or can we create an "advanced topics" sub-page?

[wouterj]

Hi @pableu. Currently, we favor large one page docs over multiple small pages. So I would suggest a "How to encrypt cache data" or the like section somewhere at the bottom of the article you're referencing.

[Nyholm]

I agree. https://symfony.com/doc/current/cache.html

👍