Determines the HTTP method and path for a given function symbol.
auto extractHTTPMethodAndName(alias Func, bool indexSpecialCase)();
The final method and path are determined from the function name, as well as
@path attributes that may be applied to it.
This function is designed for CTFE usage and will assert at run time.
A tuple of three elements is returned:
- flag "was UDA used to override path"
- URL path extracted