OIDC Provider Configuration for ConfigurationRegistrations

[jzheaux]

JwtDecoders#fromOidcIssuerLocation produces a JwtDecoder based off of the OIDC Provider Configuration endpoint [1].

OidcConfigurationProvider uses this same endpoint to produce a ClientRegistration.Builder.

OidcConfigurationProvider#fromIssuer would be better named ClientRegistrations#fromOidcIssuerLocation to align with the approach that JwtDecoders takes.

Note that doing this will break the Boot team, so we will need to coordinate with them to get this done.

[1] - https://openid.net/specs/openid-connect-discovery-1_0.html#ProviderConfig

[jzheaux]

Related - #5584