Add containers project with CMake setup and array-related functionality

- Implement `printArrayAtPosition` in `functions.cpp` with input validation.
- Created `main.cpp` to demonstrate array operations using C arrays and `std::vector`.
- Updated `ClassA` and `IComparable` with constructors, destructors, and deep copy logic.
- Adjusted IntelliJ project configuration for new containers module.

cpp/containers/functions.cpp

@@ -0,0 +1,16 @@
+#include "functions.h"
+
+#include <iostream>
+
+void printArrayAtPosition(int* array, int position) {
+    if (array == nullptr) {
+        return;
+    }
+
+    if (position < 0) {
+        return;
+    }
+
+    std::cout << "size of array: " << sizeof(array) << std::endl;
+    std::cout << array[position] << std::endl;
+}