Use IMS refresh tokens

[mfrisbey]

A user's login session will currently expire after 24 hours. We could leverage IMS refresh tokens to significantly increase the amount of time a user will remain logged in. High level details will most likely include:

• First, determine if the asset selector, or imslib2 (which the asset selector uses for its IMS authentication) will already handle this for us. If so, we should just leverage that functionality.
• If not, we may need to implement it ourselves:
  • Include the offline_access scope when performing authorization.
  • Potentially utilize onAccessTokenReceived to capture the refresh token. Hopefully the refresh token is included in the token this method provides; if not, we may need to figure out how to get it.
  • Persist the refresh token. Perhaps using the browser's local storage?
  • Use onAccessTokenExpired to read the refresh token and include it in the next authorization request?
    • Note that there is a refreshToken method on the IMS auth service instance returned by registerAssetsSelectorsAuthService(). So maybe all we'd need to do is call that method.