Add controllers for the saml-module (#1623)

composer.lock

docs/simplesamlphp-artifact-idp.md

docs/simplesamlphp-hok-idp.md

docs/simplesamlphp-idp.md

lib/SimpleSAML/Configuration.php

lib/SimpleSAML/Database.php

lib/SimpleSAML/Logger/SyslogLoggingHandler.php

lib/SimpleSAML/XHTML/IdPDisco.php

metadata-templates/saml20-sp-remote.php

modules/admin/lib/Controller/Federation.php

modules/core/docs/authproc_attributelimit.md

modules/core/lib/Auth/Process/AttributeAlter.php

modules/core/lib/Controller/Logout.php

modules/saml/lib/Auth/Source/SP.php

modules/saml/lib/Controller/Disco.php

modules/saml/lib/Controller/Proxy.php

modules/saml/lib/Controller/ServiceProvider.php

modules/saml/lib/IdP/SAML2.php

modules/saml/routing/routes/routes.yaml

modules/saml/www/disco.php