Support in-game authentication options

[mooreds]

Support in-game authentication options

Problem

Both Xbox and Steam (and possibly others) have in-game login methods. Would be great if we could "complete a login" with the token handed out by these methods in the same way as we can with an oauth token.

• Xbox XSTS tokens
• Steam SDK user ticket

This was requested by a customer.

Solution

Extend the 'complete a login' functionality of the Identity Provider to handle these other kinds of identity tokens. They are not OAuth access tokens, but could be a JWT. Details TBD.

Alternatives/workarounds

Write application code to create the user, register them, and then link their account to the corresponding FusionAuth Identity Provider.

Additional context

https://docs.microsoft.com/en-us/gaming/gdk/_content/gc/live/features/s2s-auth-calls/service-authentication/security-tokens/live-security-tokens

https://partner.steamgames.com/doc/features/auth#client_to_backend_webapi

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