Adding reflection

[schaumb]

Can you implement/use reflection to reduce the Low amount of boilerplate code based on boost::pfr?

I created a method that can be used to get the names of aggregate-type members. See here.

If we assume that the class's first member (or named with id, or const member(s?)) is the primary key, the Table objects are unnecessary (Table can be named after the type).

So the final "initialization" can be:

auto connection = Connection<orm_type_1, orm_type_2>{}; // without Table, pure classes