VS Code CMake Helper: first implementation (#1)

CMake the way CLion does it (profiles and presets, targets, run and debug
configurations, CTest)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Tomáš Černík <Tom.cernik@gmail.com>
Reviewed-on: #1

example/tests/greet_test.cpp

@@ -0,0 +1,10 @@
+#include <iostream>
+#include "greet.h"
+
+int main() {
+  if (greet("CMake") != "Hello, CMake!") {
+    std::cerr << "unexpected greeting: " << greet("CMake") << std::endl;
+    return 1;
+  }
+  return 0;
+}