feat: add roles claim to Microsoft Provider

[akadoya]

Adding roles attribute so that the client application can consume it and assign users to roles at login.
(or...exposing id_token itself also works like Okta Provider does, if you'd prefer that way)

[SergkeiM]

Hi @atymic @akadoya

Call to undefined method SocialiteProviders\Microsoft\MicrosoftUser::getRoles()

the getRoles method is not part of User class is part of Provider.

To get Roles we need to use the ArrayAccess $user->roles.