Reworked CAE security configuration API

Reworked CAE security configuration API. Turned com.coremedia.cae.security.CaeHttpSecurityConfigurer into an abstract class and removed the former caeHttpSecurityConfigurer bean of type com.coremedia.cae.security.CaeHttpSecurityConfigurer. The aspects formerly configured by that bean are now configured along with the securityFilterChain bean.

(CMS-24585)