OIDC SSO Customization: Multiple Issuers

Provide a way to support multiple issuers similar to how the Gateway OIDC plugin allows allows for:

• issuers_allowed so that more than one issuer can be specified

• extra_jwks_uris so that more than one cert can be used to verify the signature. (Potentially one jwk per issuer)

These customizations allow Konnect to integrate with highly customized legacy enterprise IdPs that may be made up of multiple tenant/"issuers" to login to Konnect.