Add MatchOperator "Or", "And" and "Average" for patterns (#755)

* wip

* ...

* .

* ...

* ...

* path

* url

* b

* t

* client

* .

* RequestMessageMethodMatcherTests

* .

* h

* .

* fix tests

* .

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

@@ -1,31 +1,39 @@
 using System.Collections.Generic;
 
-namespace WireMock.Admin.Mappings
+namespace WireMock.Admin.Mappings;
+
+/// <summary>
+/// Header Model
+/// </summary>
+[FluentBuilder.AutoGenerateBuilder]
+public class HeaderModel
 {
     /// <summary>
-    /// Header Model
+    /// Gets or sets the name.
     /// </summary>
-    [FluentBuilder.AutoGenerateBuilder]
-    public class HeaderModel
-    {
-        /// <summary>
-        /// Gets or sets the name.
-        /// </summary>
-        public string Name { get; set; } = null!;
+    public string Name { get; set; } = null!;
 
-        /// <summary>
-        /// Gets or sets the matchers.
-        /// </summary>
-        public IList<MatcherModel>? Matchers { get; set; }
+    /// <summary>
+    /// Gets or sets the matchers.
+    /// </summary>
+    public IList<MatcherModel>? Matchers { get; set; }
 
-        /// <summary>
-        /// Gets or sets the ignore case.
-        /// </summary>
-        public bool? IgnoreCase { get; set; }
+    /// <summary>
+    /// Gets or sets the ignore case.
+    /// </summary>
+    public bool? IgnoreCase { get; set; }
 
-        /// <summary>
-        /// Reject on match.
-        /// </summary>
-        public bool? RejectOnMatch { get; set; }
-    }
+    /// <summary>
+    /// Reject on match.
+    /// </summary>
+    public bool? RejectOnMatch { get; set; }
+
+    /// <summary>
+    /// The Operator to use when matchers are defined. [Optional]
+    /// - null      = Same as "or".
+    /// - "or"      = Only one pattern should match.
+    /// - "and"     = All patterns should match.
+    /// - "average" = The average value from all patterns.
+    /// </summary>
+    public string? MatchOperator { get; set; }
 }