(move duplicate code into it)

It is just prototype

* does not make top level symbols visible as class members yet
* does not take parameters
* Script class name is hardcoded now

I need in my private experiments

needed to implement @PreDestroy

move classBuilderMode to injector and GenerationState from ClassBuilder

used in JetTypeMapper in JetTypeMapper

* MapTypeMode contains no information not needed by JetTypeMapper
* MapTypeMode has separate VALUE and IMPL values that are needed to compile builtins

* cleanup after yesterday
* remove BindingContext stack in GenerationState
* use more power and strength of di

TODO: also initialize GenerationState by DI