GRAILS-11116 Custom marshaller registrar bean does not work - fixed

To fix related issue I've added setTheadLocalConverterConfiguration(converterClass, cfg) https://github.com/wololock/grails-core/compare/2.3.x?expand=1#diff-7763bcbcce7364fed09485da69ec7b8dR96 to save retrieved ConverterConfiguration and then I was able to get it via ConvertersConfigurationHolder in ConvertersConfigurationInitializer and attach previously registered marshallers. I found it as the easiest way to fix reported issue.