meta: fix is_compatible/constructible traits (#3020)

The previous version relied on the existence of an 'iterator' type.

As mentioned in comments, this is not the proper way to do it and
causes issues with certain types (e.g. views from range-v3).

Add a 'is_range' trait that properly detects the return type of
'begin'/'end', and use it in instead.

include/nlohmann/detail/meta/call_std/begin.hpp

@@ -0,0 +1,8 @@
+#pragma once
+
+#include <nlohmann/detail/macro_scope.hpp>
+
+namespace nlohmann
+{
+NLOHMANN_CAN_CALL_STD_FUNC_IMPL(begin);
+} // namespace nlohmann

include/nlohmann/detail/meta/call_std/end.hpp

@@ -0,0 +1,8 @@
+#pragma once
+
+#include <nlohmann/detail/macro_scope.hpp>
+
+namespace nlohmann
+{
+NLOHMANN_CAN_CALL_STD_FUNC_IMPL(end);
+}  // namespace nlohmann