Add rest of C++ stdlib

[anderslanglands]

C++ std:: types are translated automatically when they are found to avoid parsing the standard library headers, which are not found. So far only std::string is implemented like this in bbl_extract::stdlib.

We need to add support for the rest of the stdlib types that appear in APIs, in particular in USD:

• unique_ptr
• shared_ptr
• vector
• map
• unordered_map
• set