[CONSULT-940] add listMachineSummaries to flutter sdk

lib/src/app/app.dart

@@ -18,6 +18,15 @@ class AppClient {
 
   AppClient(this._client);
 
+  /// List all [MachineSummary]s for an organization grouped by Location
+  ///
+  /// For more information, see [Fleet Management API] ](https://docs.viam.com/appendix/apis/fleet/).
+  Future<List<LocationSummary>> listMachineSummaries(String organizationId) async {
+    final request = ListMachineSummariesRequest()..organizationId = organizationId;
+    final ListMachineSummariesResponse response = await _client.listMachineSummaries(request);
+    return response.locationSummaries;
+  }
+
   /// Get the id of the user with the email provided
   ///
   /// For more information, see [Fleet Management API](https://docs.viam.com/appendix/apis/fleet/).
@@ -29,7 +38,7 @@ class AppClient {
 
   /// Create a new [Organization]
   ///
-  /// For more information, see [Fleet Management API](https://docs.viam.com/appendix/apis/fleet/).  Future<Organization> createOrganization(String name) async {
+  /// For more information, see [Fleet Management API](https://docs.viam.com/appendix/apis/fleet/).
   Future<Organization> createOrganization(String name) async {
     final request = CreateOrganizationRequest()..name = name;
     final CreateOrganizationResponse response = await _client.createOrganization(request);

test/unit_test/app/app_client_test.dart

@@ -23,6 +23,38 @@ void main() {
   });
 
   group('App RPC Client Tests', () {
+    test('listMachineSummaries', () async {
+      final expected = [
+        LocationSummary()
+          ..locationId = 'id'
+          ..locationName = 'name'
+          ..machineSummaries.addAll([
+            MachineSummary()
+              ..machineId = 'machineId'
+              ..machineName = 'machineName'
+              ..partSummaries.addAll([
+                PartSummary()
+                  ..partId = 'partId'
+                  ..partName = 'partName'
+                  ..lastOnline = Timestamp.create()
+                  ..viamServerVersion = ViamServerVersion.create()
+                  ..viamAgentVersion = ViamAgentVersion.create()
+                  ..os = 'os'
+                  ..platform = 'platform'
+                  ..publicIpAddress = 'publicIpAddress'
+                  ..fragments.addAll([
+                    FragmentSummary()
+                      ..id = 'fragmentId'
+                      ..name = 'name'
+                  ])
+              ])
+          ])
+      ];
+      when(serviceClient.listMachineSummaries(any))
+          .thenAnswer((_) => MockResponseFuture.value(ListMachineSummariesResponse()..locationSummaries.addAll(expected)));
+      final response = await appClient.listMachineSummaries('organizationId');
+      expect(response, equals(expected));
+    });
     test('getUserIDByEmail', () async {
       when(serviceClient.getUserIDByEmail(any)).thenAnswer((_) => MockResponseFuture.value(GetUserIDByEmailResponse()..userId = 'userId'));
       final response = await appClient.getUserIdByEmail('email');