new feature needed : suport coroutine for co_yield c++20

```c++
client.Select("SELECT id, name FROM default.numbers", [] (const Block& block) -> std::generator
{
for (size_t i = 0; i < block.GetRowCount(); ++i) {
std::cout << block[0]->As()->At(i) << " "
<< block[1]->As()->At(i) << "\n";
co_yield block ;
}
}
);
```

Start by reading the client.Select callback shown in the issue and the library's existing Select API. Define the scope of C++20 coroutine support for a callback that can co_yield blocks, then verify that the provided example compiles and behaves as intended.

Scritto dal modello di indicizzazione a partire dal testo della issue.