[FEATURE REQUEST] Support more STL containers

[jharmer95]

Feature Request: Support more STL containers

Brief Summary of Request

Currently, this library only supports sequential containers like std::vector and std::array, but other container types should also have built-in support.

These include:

• std::array
• std::vector
• std::deque
• std::forward_list
• std::list
• std::set
• std::map
• std::multiset
• std::multimap
• std::unordered_set
• std::unordered_map
• std::unordered_multiset
• std::unordered_multimap

As well as container adapters:

• std::stack
• std::queue
• std::priority_queue

And a few other popular data structures:

• std::complex
• std::pair
• std::tuple

What Is The Value Added With This Feature

Easier serialization without user-defined functions.

Desired Outcome

// server
void UseMap(std::map<int, std::string> map);

// client
MyClient client;
std::map<int, std::string> my_map;

client.call_func("UseMap", my_map);

Other Details

This may be updated/replaced when C++20 is adopted.

[jharmer95]

It would be nice to have the support for containers be in separate headers (like adapters) to reduce the number of STL dependencies of #include <rpc.hpp> (at least until C++20).