feat(provider): add ciam provider

[emadabbasii]

---

Summary

This pull request introduces a new, flexible OAuth provider for CIAM (Customer Identity and Access Management) services.

Motivation

Many organizations use custom or self-hosted CIAM solutions for identity management. While many newer systems are OIDC-compliant, a significant number of them still operate as standard OAuth 2.0 servers that require the explicit configuration of endpoints.

This CiamProvider is designed to fill that gap, allowing developers to seamlessly integrate next-auth with any generic OAuth 2.0-based identity provider by manually specifying the required URLs.

Implementation Details

• Provider Type: oauth
• Configuration: Requires manual setup of authorizationUrl, tokenUrl, and userinfoUrl.
• Profile Mapping: The user's id and name are mapped from the sub claim returned by the userinfo endpoint, a standard convention.

Example Usage

import CiamProvider from "next-auth/providers/ciam";

//...
  providers: [
    CiamProvider({
      clientId: process.env.CIAM_CLIENT_ID,
      clientSecret: process.env.CIAM_CLIENT_SECRET,
      authorizationUrl: "https://my-ciam.com/auth",
      tokenUrl: "https://my-ciam.com/token",
      userinfoUrl: "https://my-ciam.com/userinfo",
      issuer: "https://my-ciam.com",
      jwksEndpoint: "https://my-ciam.com/jwks",
    }),
  ]
//...

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