feat(providers): add authgear as a provider

[buildbro]

☕️ Reasoning

Adds Authgear as a Provider, Authgear is an Open source Identity and Access Management solution developed by Oursky Limited. It can be used as an OIDC provider in small or large projects. Authgear is already used by some reputable brands in Asia and across the globe.

🧢 Checklist

• [ ] Documentation
• [ ] Tests
• [ ] Ready to be merged

🎫 Affected issues

📌 Resources

• Security guidelines
• Contributing guidelines
• Code of conduct
• Contributing to Open Source

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Name	Status	Preview	Comments	Updated (UTC)
auth-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 1, 2024 0:20am

1 Ignored Deployment

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **next-auth-docs** | ⬜️ Ignored ([Inspect](https://vercel.com/authjs/next-auth-docs/8QhoVSYiHgmzeYw4YeMSQtoyAS3B)) | [Visit Preview](https://next-auth-docs-git-fork-buildbro-main-authjs.vercel.app) | | May 1, 2024 0:20am |

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