Add Azure AD support to Explorer

[eputtone]

Add Azure AD support to the new Explorer.

If msalConfig is defined in config.js, force the user through Azure AD redirect-based login into the defined application when opening the Explorer. In the example configuration, credentials are cached in localStorage so they are available in different browser tabs as it's relatively normal to open multiple workflows to different tabs.

Because API calls are in a centralized service.ts, we cannot easily use msal-react hooks to access the authentication. Hence, the msalClient created in when opening Explorer is somewhat dirtily piggy-backed in config-object to service.ts and used to acquire and enrich the API calls with Bearer-token.

I haven't tested what happens if all the tokens (including refresh token) are expired. Probably an unclean failure, from which the user can recover by refreshing the browser and starting over. I don't have an environment where API is protected by Azure AD, so I just checked that the Authorization token is generated and set correctly.

So it's somewhat experimental support, but better than nothing and can be improved based on feedback.

[RealZimboGuy]

not sure if you would be interested, we have some code using spring security that can intercept and force a login to ldap ?