feat(captcha): Add customization options for the CAPTCHA widget

[anagstef]

🔎 Previews:

• https://clerk.com/docs/pr/2046/custom-flows/bot-sign-up-protection
• https://clerk.com/docs/pr/2046/customization/layout

What does this solve?

This gives the ability to developers to customize the appearance of the CAPTCHA widget.

What changed?

Adds 3 new appearance.layout properties for customizing the CAPTCHA widget:

• captchaTheme
• captchaSize
• captchaLanguage

Also, for custom flows we have added 3 data attributes:

• data-cl-theme
• data-cl-size
• data-cl-language

More info on this PR: clerk/javascript#5184

Checklist

• I have clicked on "Files changed" and performed a thorough self-review
• I have added the "deploy-preview" label and added the preview link(s) to this PR description
• All existing checks pass

[github-actions]

Hey, here’s your docs preview: https://clerk.com/docs/pr/2046