Add a non-compliant case.

Author: rak3-sh

cpp/autosar/test/rules/M0-1-10.1/UnusedFunction.expected

@@ -0,0 +1 @@
+| test.cpp:23:14:23:26 | uncalled_func | Function uncalled_func is never called. |

cpp/autosar/test/rules/M0-1-10.1/test.cpp

@@ -20,6 +20,11 @@ std::int32_t func1() {         // COMPLIANT: Called from main
   return mains::var + func2(); // func2 called here.
 }
 
+std::int32_t uncalled_func() // NON COMPLIANT: Not called.
+{
+  return mains::var + func1(); // func1 called here.
+}
+
 // @brief main
 // @return exit code
 std::int32_t main(void) {