feat: add property model foundation

tests/property/shell_property_test.cpp

@@ -1,4 +1,5 @@
 #include "fesa/property/ShellProperty.hpp"
+#include "fesa/property/Property.hpp"
 
 #include <stdexcept>
 
@@ -24,10 +25,17 @@ int require_throws(Function&& function) {
 
 int run_shell_property_tests() {
     const fesa::property::ShellProperty property{500, 700, 0.01};
+    const fesa::property::Property& base = property;
 
     if (const int result = require(property.id() == 500); result != 0) {
         return result;
     }
+    if (const int result = require(base.id() == 500); result != 0) {
+        return result;
+    }
+    if (const int result = require(base.kind() == fesa::property::PropertyKind::Shell); result != 0) {
+        return result;
+    }
     if (const int result = require(property.materialId() == 700); result != 0) {
         return result;
     }