SpringBoot Add Single Logout to SAML 2.0 configuration properties

SAML 2.0 Single Logout support was added in Spring Security 5.6.

In order to activate the feature, each configured RelyingPartyRegistration must set a singleLogoutServiceLocation. Currently, there is no way to provide the property using Spring Boot.

The configuration may look like this:

spring:
    security:
        saml2:
            relyingparty:
                one:
                    ...
                    slo:
                        location: /logout/saml2/slo
                        response-location: /logout/saml2/slo
                        binding: POST
                    identityprovider:
                        ...
                        singlelogout:
                            location: ...
                            response-location: ...
                            binding: POST

Comment From: wilkinsona

Thanks, @marcusdacoregio. Could you please comment on #30128 with some guidance for the other properties that may be missing?