Refactor CaptureManagementClaimsCookieEvents for better extensibility

[josephdecock]

Duende.Bff.Blazor has a cookie event where it will get the "management claims" (logout uri, session expires in, state), from the the claims service, and add them to the user's session. The idea is that we want the claims to be the same during pre-rendering (when we are reading them from the cookie) and subsequently in the UI so that, e.g., we can render a logout button statically that uses the bff:logout_uri claim.

This event should be refactored to be an IPostConfigureOptions, and not clobber the existing event using the CreateCallback pattern used elsewhere (e.g. PostConfigureSlidingExpirationCheck).