Add ability to re-encrypt secrets

[jeffpaul]

Add a WP CLI command or plugin setting to re-encrypt secrets for all users by supplying the old key and the new key.

More details to be shared.

[calvinalkan]

@jeffpaul Ping me here or in PR's

This needs to be done in batches otherwise you might take down the DB.

[jeffpaul]

@calvinalkan thanks for reaching out on this, if you've got any other technical direction then please share that here (or if you're open to crafting a PR to ensure this is done in batches then please do so and I'll coordinate on getting that reviewed/merged).

[calvinalkan]

Actually, I was thinking it might be better to force reset everything..

An inconvenience is better than a hack.

[calvinalkan]

@jeffpaul

Our library snicco/better-wpdb now has support for batch processing with db locks.

The prerequisite is PHP7.4