Add support for feature_flags claim

[kkajla12]

Add support for the feature_flags claim. This claim will be exposed on the session as featureFlags and will contain a list of the string slugs for feature flags that are enabled for the current user session based on organization membership.

const { featureFlags } = newSession;
if (featureFlags.includes('my_flag')) {
   // ...
}

[greptile-apps]

PR Summary

Implements support for feature_flags claim across the AuthKit React Router library, exposing it as featureFlags in the session object for feature flag management based on organization membership.

• ⚠️ Bug: Example code in README and PR description uses incorrect syntax includes['my_flag'] instead of includes('my_flag') for array method
• Added feature_flags to AccessToken interface and featureFlags to session-related interfaces in src/interfaces.ts
• Extended test coverage in src/auth.spec.ts and src/session.spec.ts to verify feature flag handling across authentication scenarios
• Updated session management in src/session.ts to handle feature flags during authentication and refresh flows

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