Add bicep for connector walkthrough (#169)

## Purpose
<!-- Describe the intention of the changes being proposed. What problem
does it solve or functionality does it add? -->
Add a bicep file to deploy resources used to verify that a custom
connector is working

## Does this introduce a breaking change?
<!-- Mark one with an "x". -->
```
[ ] Yes
[x] No
```

## Pull Request Type
What kind of change does this Pull Request introduce?

<!-- Please check the one that applies to this PR using "x". -->
```
[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[x] Documentation content changes
[ ] Other... Please describe:
```

Author: dominicbetts

samples/custom-connector-bicep/connector-verify.bicep

@@ -0,0 +1,173 @@
+metadata description = 'This template deploys components that are required to verify that the custom HTTP/REST connector created in the docs walkthrough is working as expected. Specific components are Event Hubs namespace an data flow'
+
+/*****************************************************************************/
+/*                          Deployment Parameters                            */
+/*****************************************************************************/
+
+param clusterName string
+param customLocationName string
+param aioExtensionName string
+param aioInstanceName string
+param aioAssetName string
+param resourceSuffix string = substring(uniqueString(subscription().id, resourceGroup().id, clusterName), 0, 10)
+param eventHubName string = 'aio-eh-${resourceSuffix}'
+param defaultDataflowEndpointName string = 'default'
+param defaultDataflowProfileName string = 'default'
+param createRoleAssignment bool = true
+
+/*****************************************************************************/
+/*                          Existing AIO cluster                             */
+/*****************************************************************************/
+
+resource connectedCluster 'Microsoft.Kubernetes/connectedClusters@2021-10-01' existing = {
+  name: clusterName
+}
+
+resource customLocation 'Microsoft.ExtendedLocation/customLocations@2021-08-31-preview' existing = {
+  name: customLocationName
+}
+
+resource aioExtension 'Microsoft.KubernetesConfiguration/extensions@2022-11-01' existing = {
+  name: aioExtensionName
+  scope: connectedCluster
+}
+
+resource aioInstance 'Microsoft.IoTOperations/instances@2025-04-01' existing = {
+  name: aioInstanceName
+}
+
+resource defaultDataflowEndpoint 'Microsoft.IoTOperations/instances/dataflowEndpoints@2025-04-01' existing = {
+  name: defaultDataflowEndpointName
+}
+
+resource defaultDataflowProfile 'Microsoft.IoTOperations/instances/dataflowProfiles@2025-04-01' existing = {
+  name: defaultDataflowProfileName
+  parent: aioInstance
+}
+
+/*****************************************************************************/
+/*                                  Event Hub                                */
+/*****************************************************************************/
+
+resource eventHubNamespace 'Microsoft.EventHub/namespaces@2024-01-01' = {
+  name: eventHubName
+  location: resourceGroup().location
+  sku: {
+    name: 'Standard'
+    tier: 'Standard'
+    capacity: 1
+  }
+  properties: {
+    disableLocalAuth: true
+    minimumTlsVersion: '1.2'
+  }
+}
+
+// Role assignment for Event Hubs Data Sender role
+resource roleAssignmentDataSender 'Microsoft.Authorization/roleAssignments@2022-04-01' = if (createRoleAssignment) {
+  name: guid(eventHubNamespace.id, aioExtension.id, '69b88ce2-a752-421f-bd8b-e230189e1d63')
+  scope: eventHubNamespace
+  properties: {
+    // ID for Event Hubs Data Sender role is 2b629674-e913-4c01-ae53-ef4638d8f975
+    roleDefinitionId: resourceId('Microsoft.Authorization/roleDefinitions', '2b629674-e913-4c01-ae53-ef4638d8f975')
+    principalId: aioExtension.identity.principalId
+    principalType: 'ServicePrincipal'
+  }
+}
+
+resource eventHub 'Microsoft.EventHub/namespaces/eventhubs@2024-01-01' = {
+  name: 'thermostateh'
+  parent: eventHubNamespace
+  properties: {
+    messageRetentionInDays: 1
+    partitionCount: 1
+  }
+}
+
+/*****************************************************************************/
+/*                                    Data flow                              */
+/*****************************************************************************/
+
+resource dataflowEndpointEventHub 'Microsoft.IoTOperations/instances/dataflowEndpoints@2025-04-01' = {
+  parent: aioInstance
+  name: 'thermostat-eh-endpoint'
+  extendedLocation: {
+    name: customLocation.id
+    type: 'CustomLocation'
+  }
+  properties: {
+    endpointType: 'Kafka'
+    kafkaSettings: {
+      host: '${eventHubName}.servicebus.windows.net:9093'
+      batching: {
+        latencyMs: 0
+        maxMessages: 100
+      }
+      tls: {
+        mode: 'Enabled'
+      }
+      authentication: {
+        method: 'SystemAssignedManagedIdentity'
+        systemAssignedManagedIdentitySettings: {
+          audience: 'https://${eventHubName}.servicebus.windows.net'
+        }
+      }
+    }
+  }
+  dependsOn: [
+    eventHubNamespace
+  ]
+}
+
+resource dataflowThermostat 'Microsoft.IoTOperations/instances/dataflowProfiles/dataflows@2025-04-01' = {
+  parent: defaultDataflowProfile
+  name: 'thermostat-data-flow'
+  extendedLocation: {
+    name: customLocation.id
+    type: 'CustomLocation'
+  }
+  properties: {
+    mode: 'Enabled'
+    operations: [
+      {
+        operationType: 'Source'
+        sourceSettings: {
+          endpointRef: defaultDataflowEndpoint.name
+          assetRef: aioAssetName
+          serializationFormat: 'Json'
+          dataSources: ['machine/thermostat1/status']
+        }
+      }
+      {
+        operationType: 'BuiltInTransformation'
+        builtInTransformationSettings: {
+          serializationFormat: 'Json'
+          map: [
+            {
+              type: 'PassThrough'
+              inputs: [
+                '*'
+              ]
+              output: '*'
+            }
+          ]
+        }
+      }
+      {
+        operationType: 'Destination'
+        destinationSettings: {
+          endpointRef: dataflowEndpointEventHub.name
+          dataDestination: 'thermostateh'
+        }
+      }
+    ]
+  }
+  dependsOn: [
+    eventHub
+  ]
+}
+
+output eventHub object = {
+  namespace: eventHubNamespace.name
+  name: eventHub.name
+}