Tutorial: Rewrite using conventions enabled by CMake 3.23

This is a full re-write of the CMake Tutorial for CMake 3.23, both
the functionality it provides, as well as the modern workflows that
developers use when interfacing with CMake.

Issue: #22663, #23086, #23799, #26053, #26105, #26153, #26914

Help/guide/tutorial/Step8/Tutorial/CMakeLists.txt

@@ -0,0 +1,29 @@
+add_executable(Tutorial)
+
+target_sources(Tutorial
+  PRIVATE
+    Tutorial.cxx
+)
+
+target_link_libraries(Tutorial
+  PRIVATE
+    MathFunctions
+)
+
+target_compile_features(Tutorial PRIVATE cxx_std_20)
+
+if(
+  (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") OR
+  (CMAKE_CXX_COMPILER_FRONTEND_VARIANT STREQUAL "MSVC")
+)
+
+  target_compile_options(Tutorial PRIVATE /W3)
+
+elseif(
+  (CMAKE_CXX_COMPILER_ID STREQUAL "GNU") OR
+  (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+)
+
+  target_compile_options(Tutorial PRIVATE -Wall)
+
+endif()

Help/guide/tutorial/Step8/Tutorial/Tutorial.cxx

@@ -0,0 +1,26 @@
+// A simple program that computes the square root of a number
+#include <format>
+#include <iostream>
+#include <string>
+
+#include <MathFunctions.h>
+
+int main(int argc, char* argv[])
+{
+  if (argc < 2) {
+    std::cout << std::format("Usage: {} number\n", argv[0]);
+    return 1;
+  }
+
+  // convert input to double
+  double const inputValue = std::stod(argv[1]);
+
+  // calculate square root
+  double const outputValue = mathfunctions::sqrt(inputValue);
+  std::cout << std::format("The square root of {} is {}\n", inputValue,
+                           outputValue);
+
+  double const checkValue = mathfunctions::OpMul(outputValue, outputValue);
+  std::cout << std::format("The square of {} is {}\n", outputValue,
+                           checkValue);
+}