feat(pubsub): expose a publisher client

Author: suzmue

Cargo.lock

@@ -41,4 +41,6 @@ tracing.workspace     = true
 wkt.workspace         = true
 
 [dev-dependencies]
+anyhow.workspace     = true
 tokio-test.workspace = true
+tokio.workspace      = true

src/pubsub/Cargo.toml

@@ -13,3 +13,4 @@
 // limitations under the License.
 
 pub(crate) mod gapic;
+pub(crate) mod gapic_internal;

src/pubsub/src/generated.rs

@@ -38,11 +38,14 @@ included-ids = """\
     .google.pubsub.v1.Subscriber.CreateSnapshot,\
     .google.pubsub.v1.Subscriber.UpdateSnapshot,\
     .google.pubsub.v1.Subscriber.DeleteSnapshot,\
-    .google.pubsub.v1.Subscriber.Seek\
+    .google.pubsub.v1.Subscriber.Seek,\
+    .google.pubsub.v1.PublishRequest,\
+    .google.pubsub.v1.PublishResponse\
     """
 
 [codec]
 copyright-year        = '2025'
 template-override     = 'templates/http-client'
 package-name-override = 'google-cloud-pubsub'
 name-overrides        = '.google.pubsub.v1.Publisher=TopicAdmin,.google.pubsub.v1.Subscriber=SubscriptionAdmin'
+internal-types        = ".google.pubsub.v1.PublishRequest"