feat(ui): Implement `<SignUp />` localizations

[alexcarpenter]

Description

• Adds makeLocalizeable util
• Implements localizations within <SignUp /> steps
• Refactors <Field.Optional /> to be <Field.Hint />
• Exposes strings as props on field components

Pulls a lot of existing code from

• https://github.com/clerk/javascript/blob/aa4cd761585b888706a36a6eed7436a8f0476dbf/packages/clerk-js/src/ui/localization/makeLocalizable.tsx
• https://github.com/clerk/javascript/blob/5764e2911790051589bb5c4f3b1a2c79f7f30c7e/packages/clerk-js/src/ui/localization/localizationKeys.ts

but opted for a function to retrieve the localized string vs the makeLocalizable component wrapper.

DEFAULT enUS:

CUSTOM arSA:

https://linear.app/clerk/issue/SDKI-67/implement-signup-localization

Will follow up with error translations based on this thread https://clerkinc.slack.com/archives/C05ST2R2HM3/p1718741779381069

Checklist

• [ ] npm test runs as expected.
• [ ] npm run build runs as expected.
• [ ] (If applicable) JSDoc comments have been added or updated for any package exports
• [ ] (If applicable) Documentation has been updated

Type of change

• [ ] 🐛 Bug fix
• [x] 🌟 New feature
• [ ] 🔨 Breaking change
• [x] 📖 Refactoring / dependency upgrade / documentation
• [ ] other:

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: a0b21126e3f350437d3bd4b1f86485d9617f6781

The changes in this PR will be included in the next version bump.

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[joe-bell]

Really solid work Alex, thank you! I'll go ahead and merge to prevent any conflict pain

[joe-bell]

Created two follow-up tickets in Linear; I'll ping you internally