Change QueryPart rendering and binding API to use Configuration and Context as callback parameters

[lukaseder]

The current API consists of

bindReference(Configuration, ..);
bindDeclaration(Configuration, ..);
toSQLReference(Configuration, ..);
toSQLDeclaration(Configuration, ..);

This is not good enough for some use cases. The API needs to be adapted every time a new parameter needs to be passed to sub-parts. A better API is to introduce a new Context type, which has the life-span of one rendering call or one binding call (unlike the Configuration:

void toSQL(Configuration, RenderingContext);
void bind(Configuration, BindingContext);

with

interface RenderingContext {
  StringBuilder builder();
  boolean asDeclaration();
  boolean inlineParameters();
  boolean inSubquery();
}

interface BindingContext {
  int index();
  void index(int index);
  boolean asDeclaration();
}