* Move materialization logic from TableProcessorNode to KTableImpl 1. TableProcessorNode: remove materializedInternal, use storeBuilder instead. 2. Instantiate StoreBuilder in KTableImpl#[doFilter, doMapValues, doTransformValues], instead of TableProcessorNode#init. * Cleanup KTableImpl#doMapValues * 1. Add TableProcessorNode(String, ProcessorParameters, StoreBuilder). 2. Reformat+trivial changes on TableProcessorNode.java.