Add Settings.QueryParameterMultipleValueSupport (#836)

* QueryParameterMultipleValueSupport

* .

* ,

* ,

src/WireMock.Net.Abstractions/Types/QueryParameterMultipleValueSupport.cs

@@ -0,0 +1,28 @@
+using System;
+
+namespace WireMock.Types;
+
+[Flags]
+public enum QueryParameterMultipleValueSupport
+{
+    // Support none
+    None = 0x0,
+
+    // Support "&" as multi-value-separator --> "key=value&key=anotherValue"
+    Ampersand = 0x1,
+
+    // Support ";" as multi-value-separator --> "key=value;key=anotherValue"
+    SemiColon = 0x2,
+
+    // Support "," as multi-value-separator -->  "key=1,2"
+    Comma = 0x4,
+
+    // Support "&" and ";" as multi-value-separator --> "key=value&key=anotherValue" and also "key=value;key=anotherValue"
+    AmpersandAndSemiColon = Ampersand | SemiColon,
+
+    // Support "&" and ";" as multi-value-separator
+    NoComma = AmpersandAndSemiColon,
+
+    // Support all multi-value-separators ("&" and ";" and ",")
+    All = Ampersand | SemiColon | Comma
+}