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

Adds support for the feature_flags claim in the AuthKit React library, enabling feature flag access through the session object to control feature availability based on organization membership.

• Feature flags will be exposed via featureFlags property in the session object, providing a type-safe way to check enabled features
• Implementation follows TypeScript best practices by extending existing session types to include the new featureFlags array
• Example usage demonstrates straightforward feature flag checking with includes() method

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