Update public api interface and refactor tests

Author: MaggieKimani1

test/Microsoft.OpenApi.Tests/Models/OpenApiOperationTests.cs

@@ -334,11 +334,13 @@ public void SerializeOperationWithBodyAsV3JsonWorks()
   ""parameters"": [
     {
       ""name"": ""parameter1"",
-      ""in"": ""path""
+      ""in"": ""path"",
+      ""style"": ""simple""
     },
     {
       ""name"": ""parameter2"",
-      ""in"": ""header""
+      ""in"": ""header"",
+      ""style"": ""simple""
     }
   ],
   ""requestBody"": {
@@ -407,11 +409,13 @@ public void SerializeAdvancedOperationWithTagAndSecurityAsV3JsonWorks()
   ""parameters"": [
     {
       ""name"": ""parameter1"",
-      ""in"": ""path""
+      ""in"": ""path"",
+      ""style"": ""simple""
     },
     {
       ""name"": ""parameter2"",
-      ""in"": ""header""
+      ""in"": ""header"",
+      ""style"": ""simple""
     }
   ],
   ""requestBody"": {
@@ -501,6 +505,7 @@ public void SerializeOperationWithFormDataAsV3JsonWorks()
       ""in"": ""path"",
       ""description"": ""ID of pet that needs to be updated"",
       ""required"": true,
+      ""style"": ""simple"",
       ""schema"": {
         ""type"": ""string""
       }

test/Microsoft.OpenApi.Tests/Models/OpenApiParameterTests.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license. 
 
 using System.Collections.Generic;
@@ -208,7 +208,8 @@ public void SerializeBasicParameterAsV3JsonWorks()
             // Arrange
             var expected = @"{
   ""name"": ""name1"",
-  ""in"": ""path""
+  ""in"": ""path"",
+  ""style"": ""simple""
 }";
 
             // Act

test/Microsoft.OpenApi.Tests/PublicApi/PublicApi.approved.txt

@@ -719,6 +719,7 @@ namespace Microsoft.OpenApi.Models
     }
     public class OpenApiParameter : Microsoft.OpenApi.Interfaces.IEffective<Microsoft.OpenApi.Models.OpenApiParameter>, Microsoft.OpenApi.Interfaces.IOpenApiElement, Microsoft.OpenApi.Interfaces.IOpenApiExtensible, Microsoft.OpenApi.Interfaces.IOpenApiReferenceable, Microsoft.OpenApi.Interfaces.IOpenApiSerializable
     {
+        public Microsoft.OpenApi.Models.ParameterStyle? _style;
         public OpenApiParameter() { }
         public OpenApiParameter(Microsoft.OpenApi.Models.OpenApiParameter parameter) { }
         public bool AllowEmptyValue { get; set; }