Adds Darwin build presets with Vcpkg support

Adds new CMake presets for Darwin platforms, including debug and release configurations with optional Vcpkg integration.
This allows for easier builds on Darwin systems utilizing pre-built libraries from Vcpkg.

CMakePresets.json

@@ -129,6 +129,15 @@
         "CMAKE_BUILD_TYPE": "Debug"
       }
     },
+    {
+      "name": "darwin-debug-vcpkg",
+      "displayName": "Darwin Debug",
+      "inherits": "darwin-base",
+      "cacheVariables": {
+        "CMAKE_BUILD_TYPE": "Debug",
+        "OMATH_BUILD_VIA_VCPKG": "ON"
+      }
+    },
     {
       "name": "darwin-release",
       "displayName": "Darwin Release",
@@ -136,6 +145,15 @@
       "cacheVariables": {
         "CMAKE_BUILD_TYPE": "Release"
       }
+    },
+    {
+      "name": "darwin-release-vcpkg",
+      "displayName": "Darwin Release",
+      "inherits": "darwin-debug",
+      "cacheVariables": {
+        "CMAKE_BUILD_TYPE": "Release",
+        "OMATH_BUILD_VIA_VCPKG": "ON"
+      }
     }
   ]
 }