please make ntsa::SocketOption::print() output include option type

```C++
ntsa::SocketOption so1;
so1.makeLinger();

ntsa::SocketOption so2;
so2.makeZeroCopy();

std::cout << "so1=" << so1 << std::endl;
std::cout << "so2=" << so2 << std::endl;
```

outputs:
```
so1=LINGER[ enabled = false duration = (4829128, 21860576) ]
so2=0
```

If the first line of the output is actually useful to convey the option type and its value, the 2nd line is not so much. I suggest you always include both option type and the value in the string representation of `ntsa::SocketOption` values.

Locate the implementation of ntsa::SocketOption::print() and inspect how different option types are rendered, beginning with the LINGER and zero-copy cases shown in the issue. Compare their current string representations and identify the existing tests for SocketOption formatting, if present. Done means every SocketOption string representation includes both its option type and value consistently.

Written by the indexing model from the issue text.