Constructor Template Auto Deduction guides

It seems with Hana in Boost 1.67 it doesn't have Compiler Template Auto Deduction guides.

This doesn't compile:
```c++
#include

namespace hana = boost::hana;

int main() {
auto args = hana::tuple(10, 0.5, "hello world");
}
```

But if we add some deduction guides, it can compile:

```c++
#include

namespace hana = boost::hana;

namespace boost::hana {
template
tuple(Args&&...) -> tuple;
}

int main() {
auto args = hana::tuple(10, 0.5, "hello world");
}
```

Would be a good addition.

Start by reproducing the example with boost/hana.hpp and inspect how hana::tuple is defined and constructed. Determine the supported language modes and verify the deduction-guide approach against existing tuple behavior. Done means the reported example compiles in supported configurations and the behavior has regression coverage.

Written by the indexing model from the issue text.