feat: provide and use a common calling interface to all chapter tests

chapters/interface/CMakeLists.txt

@@ -0,0 +1,3 @@
+add_library(chapter_interface INTERFACE)
+target_compile_features(chapter_interface INTERFACE cxx_std_20)
+target_include_directories(chapter_interface INTERFACE include)

chapters/interface/include/chapter_interface.h

@@ -0,0 +1,7 @@
+#pragma once
+
+class ChapterTest {
+public:
+  virtual ~ChapterTest() = default;
+  virtual void test() = 0;
+};