Add support for Initiating User Registration via OpenID Connect 1.0

[Aaron-Ritter]

Initiating User Registration via OpenID Connect 1.0

Problem

When using OpenID Connect the Registration URL is not an option as it breaks the OpenID Connect flow at the oauth-callback.

Solution

Support the create prompt as specified in https://openid.net/specs/openid-connect-prompt-create-1_0.html.

Alternatives/workarounds

In theory any other additional parameter to the authorize endpoint which lets FusionAuth display the Registration is an option but as there is a specification for it this is not desired.

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