Fix IS Token Validation issues with AsgardeoV2 (Thunder)

[brionmario]

Purpose

This pull request introduces a minor type improvement to the internationalization model and enhances the authentication helper to support a new platform (AsgardeoV2), ensuring compliance with OpenID Connect Discovery specifications. The most important changes are:

Authentication Helper Enhancements:

• Updated the authentication helper to detect when the platform is AsgardeoV2 and set the issuer endpoint to the base URL, aligning with RFC 8414 and OpenID Connect Discovery requirements. This ensures correct metadata endpoint derivation and improves standards compliance.
• Added imports for Config and Platform to support the new platform detection logic in the authentication helper.

Internationalization Model Update:

• Relaxed the type of the direction property in the I18nMetadata interface from I18nTextDirection to I18nTextDirection | string, allowing for greater flexibility in specifying text direction.

Related Issues

• Fixes bug: fix the issuer to use the base url of the Authorization Server rather than <BASE_URL>/oauth2/token #322

Related PRs

• N/A

Checklist

• Followed the CONTRIBUTING guidelines.
• Manual test round performed and verified.
• Documentation provided. (Add links if there are any)
• Unit tests provided. (Add links if there are any)

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines?
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets?

[asgardeo-github-bot]

🦋 Changeset detected

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

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