Add an authentication service for the Microsoft OAuth2 On-Behalf-Of flow #14
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This PR adds the config and provider for the Microsoft Azure AD / Entra On-Behalf-Of flow. An authentication service can be created and used in the same way as the existing "Azure Active Directory OAuth" service, but this service will make an additional OAuth token request, to exchange the first access token for a new one, that will allow DreamFactory to call the target API on behalf of the authenticated user.
See the OBO flow documentation here: https://learn.microsoft.com/en-us/entra/identity-platform/v2-oauth2-on-behalf-of-flow
This PR depends on the accompanying PR in the df-oauth repo: dreamfactorysoftware/df-oauth#42