Add blacklist for Request Cookies. (#319)

* Add blacklist for Request Cookies.
Refactor code. Fix tests.

* Fix tests and address code review notes

* Fix tests

src/WireMock.Net/Settings/IProxyAndRecordSettings.cs

@@ -30,5 +30,10 @@
         /// Defines a list from headers which will excluded from the saved mappings.
         /// </summary>
         string[] BlackListedHeaders { get; set; }
+
+        /// <summary>
+        /// Defines a list of cookies which will excluded from the saved mappings.
+        /// </summary>
+        string[] BlackListedCookies { get; set; }
     }
 }

src/WireMock.Net/Settings/ProxyAndRecordSettings.cs

@@ -26,5 +26,9 @@ namespace WireMock.Settings
         /// <inheritdoc cref="IProxyAndRecordSettings.BlackListedHeaders"/>
         [PublicAPI]
         public string[] BlackListedHeaders { get; set; }
+
+        /// <inheritdoc cref="IProxyAndRecordSettings.BlackListedCookies"/>
+        [PublicAPI]
+        public string[] BlackListedCookies { get; set; }
     }
 }