fix: refresh access token or sign out from sample app when unauthorised

[damiann5f]

Summary

• All providers throw OmhStorageException.ApiException with 401 status code when unauthorized.
• Sample app handles this exception by trying to refresh token and if failed, signing out user.

Demo

n/a

Checklist:

• [x] Documentation is up to date to reflect these changes
• [x] Created Unit tests

Closes: OMHD-464