container: root: rewrite throw handler, refactor using common types

- Refactor using common types that were once internal
- Removes ancient macro approaches to C++20 solutions
- Changes `Exception` message type to use std::string
  * std::string_view isn't worthwhile in this context

container/src/root/test/common/type.hh

@@ -25,7 +25,7 @@
 
 #include <gtest/gtest.h>
 
-#include <string_view>
+#include <string>
 
 #include "../../src/internal/type.hh"
 
@@ -50,8 +50,8 @@ namespace unit
 struct Exception : public ::testing::Test
 {
  protected:
-  std::string_view what = "better to be caught than thrown";
-  using t_type = type::Exception::kType;
+  std::string what = "better to be caught than thrown";
+  using t_type = ::dfi::common::type::Exception::kType;
 };
 }  // namespace unit
 }  // namespace tests