Add explicit initialization to AdapterFactory

[redcatbear]

Situation

When an AdapterFactory implementation is instantiated, not all aspects are necessarily hard-coded. For example the JdbcAdapterFactory must use the ServiceLoader in order to find out which SQL dialects it supports.

To avoid any chicken-of-the-egg problems, we add a new initialization method to the AdapterFactory that is guaranteed to be called before any of the other methods in that interface.