[clang][TypePrinter] Add option to skip over elaborated types

Elaborated types are sugar that represent how the type was spelled in
the original source. When printing a type outside of that original
context, the qualifiers as saved in the elaborated type will be
incorrect. Additionally, their existence also inhibits the use of
`PrintingCallbacks::isScopeVisible` as a customization point.

Differential Revision: https://reviews.llvm.org/D149677