Make the default regex mode use `regress` for JS-flavor regex format validation about check-jsonschema HOT 4 CLOSED

(I would maybe name the regress one js or ecma or ecmascript or javascript or whatever personally, so users don't need to even know what the heck regress is, but that's probably the easy part!)

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I have to stash my work on this for now, but I'll be keeping an eye on regress in order to pick this back up when I can. There's a bug in regress which is causing issues with the named capture groups used in the renovate schema.

I took a quick crack at a PR for this: ridiculousfish/regress#67

I think that fix is right; if it or an alternative fix gets merged, I can try to put in a PR to prep a release of crate-py/regress, and hopefully this all flows forwards nicely.

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My PR was merged just under a week ago, but I'm not sure what the regress crate release cycle looks like.
At the risk of nagging, I've filed a follow-up to ask for a release and provide some context: ridiculousfish/regress#68

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This is now in main and I'll be releasing it shortly -- partly to kick the tires on some new publishing workflows.

Because we might have a way for pattern and patternProperties to use an alternate regex implementation someday, I took a moment to restructure this to a RegexImplementation class.

It's still very much wired up to format checking, but it should be easy to move elsewhere and grow it as new features become available.

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