Provide addAsServiceProvider overload that supports String

In some cases you want to package ServiceProviderInterfaces to might not be available/loadable at package time.

This only work if CDI API is on client path

.addAsServiceProvider(Extension.class, CDIExtension.class);

A possible overload could be:

.addAsServiceProvider("javax.enterprise.inject.spi.Extension", "my.cdi.CDIExtension");