make explicit build error if compiler version is below C++17 to avoid cryptic errors on user machines

[milyin]

Describe the release item

There is a report that is_value_reference_v not found. This may happen if compiler lower than C++17 is used. We need to explicitly check this:

typename std::conditional_t<std::is_lvalue_reference_v<D>, D, std::remove_reference_t<D>> _drop;
                                      ^~~~~~~~~~~~~~~~~~~~~
                                      is_lvalue_reference
/usr/local/include/zenoh/detail/closures.hxx:48:38: error: ‘is_lvalue_reference_v’ is not a member of ‘std’
/usr/local/include/zenoh/detail/closures.hxx:48:38: note: suggested alternative: ‘is_lvalue_reference’