Fix WithBody when using Pact and added more nullable annotations (#783)

* More nullable annotations

* .

* .

* FIX

* pact

* .

* p

* xxx

* ...

* auth

* array

* ...

src/WireMock.Net.Abstractions/Admin/Mappings/WebProxyModel.cs

@@ -1,24 +1,23 @@
-namespace WireMock.Admin.Mappings
+namespace WireMock.Admin.Mappings;
+
+/// <summary>
+/// WebProxy settings
+/// </summary>
+[FluentBuilder.AutoGenerateBuilder]
+public class WebProxyModel
 {
     /// <summary>
-    /// WebProxy settings
+    /// A string instance that contains the address of the proxy server.
     /// </summary>
-    [FluentBuilder.AutoGenerateBuilder]
-    public class WebProxyModel
-    {
-        /// <summary>
-        /// A string instance that contains the address of the proxy server.
-        /// </summary>
-        public string Address { get; set; }
+    public string Address { get; set; } = null!;
 
-        /// <summary>
-        /// The user name associated with the credentials.
-        /// </summary>
-        public string UserName { get; set; }
+    /// <summary>
+    /// The user name associated with the credentials. [optional]
+    /// </summary>
+    public string? UserName { get; set; }
 
-        /// <summary>
-        /// The password for the user name associated with the credentials.
-        /// </summary>
-        public string Password { get; set; }
-    }
+    /// <summary>
+    /// The password for the user name associated with the credentials. [optional]
+    /// </summary>
+    public string? Password { get; set; }
 }