[clang-repl] Lay the basic infrastructure for pretty printing of types (#148701)

The idea is to store a type-value pair in clang::Value which is updated
by the interpreter runtime. The class copies builtin types and boxes
non-builtin types to provide some lifetime control.

The patch enables default printers for C and C++ using a very
minimalistic approach. We handle enums, arrays and user types. Once we
land this we can focus on enabling user-defined pretty-printers which
take control over printing of types

The work started as part of https://reviews.llvm.org/D146809, then we
created a giant in https://github.com/llvm/llvm-project/pull/84769

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