feat: Add new gcloud commands, API clients, and third-party libraries across various services.

gcloud auth application-default login/google-cloud-sdk/lib/surface/iap/oauth_clients/describe.yaml

@@ -0,0 +1,27 @@
+release_tracks: [ALPHA, BETA, GA]
+help_text:
+  brief: |
+    Describe a Cloud IAP OAuth client.
+  description: |
+    *{command}* is used to describe a Cloud IAP OAuth client. Note this command cannot be used to
+    describe any other type of OAuth client in your project.
+  examples: |
+    To describe a Cloud IAP OAuth client for the current project, run:
+
+        $ {command} NAME
+
+    To describe a Cloud IAP OAuth client for a specific brand, run:
+
+        $ {command} NAME --brand=BRAND
+
+request:
+  collection: iap.projects.brands.identityAwareProxyClients
+  api_version: v1
+
+arguments:
+  resource:
+    spec: !REF googlecloudsdk.command_lib.iap.resources:client
+    arg_name: name
+    is_positional: true
+    help_text: |
+      Name of the Cloud IAP OAuth client to describe.