Use ILRepack to include Microsoft.OpenApi as internal (#1290)

* .

* Use ILRepack to include Microsoft.OpenApi as internal

* ...

* OpenApiSpecificationVersion

* .

* 080

* 4

src-old/WireMock.Net.OpenApiParser/Utils/PathUtils.cs

@@ -0,0 +1,27 @@
+// Copyright © WireMock.Net
+
+namespace WireMock.Net.OpenApiParser.Utils;
+
+internal static class PathUtils
+{
+    internal static string Combine(params string[] paths)
+    {
+        if (paths.Length == 0)
+        {
+            return string.Empty;
+        }
+
+        var result = paths[0].Trim().TrimEnd('/');
+
+        for (int i = 1; i < paths.Length; i++)
+        {
+            var nextPath = paths[i].Trim().TrimStart('/').TrimEnd('/');
+            if (!string.IsNullOrEmpty(nextPath))
+            {
+                result += '/' + nextPath;
+            }
+        }
+
+        return result;
+    }
+}