feat: add domain model foundation

tests/core/element_definition_test.cpp

@@ -0,0 +1,41 @@
+#include "fesa/core/ElementDefinition.hpp"
+
+namespace {
+
+int require(bool condition) {
+    return condition ? 0 : 1;
+}
+
+} // namespace
+
+int run_element_definition_tests() {
+    const fesa::core::ElementDefinition element{
+        100,
+        fesa::core::ElementType::Mitc4,
+        {1, 2, 3, 4},
+        500};
+
+    if (const int result = require(element.id() == 100); result != 0) {
+        return result;
+    }
+    if (const int result = require(element.type() == fesa::core::ElementType::Mitc4); result != 0) {
+        return result;
+    }
+    if (const int result = require(element.connectivity()[0] == 1); result != 0) {
+        return result;
+    }
+    if (const int result = require(element.connectivity()[1] == 2); result != 0) {
+        return result;
+    }
+    if (const int result = require(element.connectivity()[2] == 3); result != 0) {
+        return result;
+    }
+    if (const int result = require(element.connectivity()[3] == 4); result != 0) {
+        return result;
+    }
+    if (const int result = require(element.propertyId() == 500); result != 0) {
+        return result;
+    }
+
+    return 0;
+}