[Purview] Design Refactor for Scanning (#20811)

Based on feedback with the C# architects, we've made some changes to
the class factoring here and renamed some methods. The goal was to try
to reduce the number of clients we have and clean up some naming
issues.

sdk/purview/Azure.Analytics.Purview.Scanning/src/Customizations/PurviewClassificationRuleClient.cs

@@ -0,0 +1,18 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using System;
+using Azure.Core.Pipeline;
+
+namespace Azure.Analytics.Purview.Scanning
+{
+    public partial class PurviewClassificationRuleClient
+    {
+        internal PurviewClassificationRuleClient(Uri endpoint, string classificationRuleName, HttpPipeline pipeline, string apiVersion) {
+            this.endpoint = endpoint;
+            this.Pipeline = pipeline;
+            this.classificationRuleName = classificationRuleName;
+            this.apiVersion = apiVersion;
+        }
+    }
+}

sdk/purview/Azure.Analytics.Purview.Scanning/src/Customizations/PurviewDataSourceClient.cs

@@ -0,0 +1,21 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using System;
+using Azure.Core.Pipeline;
+
+namespace Azure.Analytics.Purview.Scanning
+{
+    public partial class PurviewDataSourceClient
+    {
+        internal PurviewDataSourceClient(Uri endpoint, string dataSourceName, HttpPipeline pipeline, string apiVersion) {
+            this.endpoint = endpoint;
+            this.dataSourceName= dataSourceName;
+            this.Pipeline = pipeline;
+            this.apiVersion = apiVersion;
+        }
+
+        /// <summary />
+        public PurviewScanClient GetScanClient(string scanName) => new PurviewScanClient(endpoint, dataSourceName, scanName, Pipeline, apiVersion);
+    }
+}

sdk/purview/Azure.Analytics.Purview.Scanning/src/Customizations/PurviewScanClient.cs

@@ -0,0 +1,19 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using System;
+using Azure.Core.Pipeline;
+
+namespace Azure.Analytics.Purview.Scanning
+{
+    public partial class PurviewScanClient
+    {
+        internal PurviewScanClient(Uri endpoint, string dataSourceName, string scanName, HttpPipeline pipeline, string apiVersion) {
+            this.endpoint = endpoint;
+            this.dataSourceName= dataSourceName;
+            this.scanName = scanName;
+            this.Pipeline = pipeline;
+            this.apiVersion = apiVersion;
+        }
+    }
+}

sdk/purview/Azure.Analytics.Purview.Scanning/src/Customizations/PurviewScanningClient.cs

@@ -0,0 +1,14 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+namespace Azure.Analytics.Purview.Scanning
+{
+    public partial class PurviewScanningServiceClient
+    {
+        /// <summary />
+        public PurviewDataSourceClient GetDataSourceClient(string dataSourceName) => new PurviewDataSourceClient(endpoint, dataSourceName, Pipeline, apiVersion);
+
+        /// <summary />
+        public PurviewClassificationRuleClient GetClassificationRuleClient(string classificationRuleName) => new PurviewClassificationRuleClient(endpoint, classificationRuleName, Pipeline, apiVersion);
+    }
+}