Validate if authentication plugin class name are valid

Validate if authentication plugin class name are valid authentication class names; and if it is not valid then Solr has to write a WARN log

As per Solr 9 documents following are the valid authentication plugin names

{{

"solr.BasicAuthPlugin", "solr.JWTAuthPlugin", "solr.HadoopAuthPlugin", 
"solr.ConfigurableInternodeAuthHadoopPlugin", "solr.CertAuthPlugin", "solr.MultiAuthPlugin", 
"solr.KerberosPlugin"

}}