docs: note redux-persist maintenance status in persistence guide

[Hashim1999164]

Summary

• Add a caution note under the Redux Persist section of the RTK Query persistence guide
• Clarifies that redux-persist is no longer actively maintained (last release in 2019)
• Keeps the existing REHYDRATE example intact and notes the same extractRehydrationInfo pattern works with other persistence libraries

Fixes #5180

Test plan

• Verified Prettier formatting on the edited MDX file
• Confirmed the admonition matches existing :::caution style in the docs

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[mdemichele]

Just wanted to mention, I started up a fork of redux-persist that is being actively maintained: https://github.com/mdemichele/redux-persist.

We've shipped a couple of releases past the last release from the original repo. Instead of just marking the original repo as unmaintained, feel free to link to my fork.

I haven't seen any other active forks of redux-persist, so I'd be happy to pick up the ball as the official maintainer. Seems like usage of redux-persist is still really widespread, so I'm trying to make sure we keep support for it going and make sure it continues to work well with redux-toolkit.

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commit: e1fdb81

[Hashim1999164]

Thanks for the heads up, good to know an actively maintained fork exists. Whether the official docs should point to a community fork feels like a call for the Redux team rather than something I want to slip into this PR, so I will keep the change scoped to documenting the current state of the upstream repo. If the maintainers want a link to your fork added I am happy to include it.

[mdemichele]

Makes sense to me. I definitely agree it's worthwhile to flag the old redux-persist repo as unmaintained, so makes sense to focus on that first.

FWIW, in case it helps my case for including the new fork, we did also make significant progress on our documentation and have a working example application demonstrating usage of our forked version of redux-persist with RTK. Will be focusing on getting any remaining compatibility issues fixed as well.