feat(ai/generativelanguage/apiv1beta): add SetGoogleClientInfo for all clients (#10272)

Add exported SetGoogleClientInfo methods for all clients
in the API.

Also, add a script to generate the info.go file from the
clients.

Author: jba

ai/generativelanguage/apiv1beta/gen_info.sh

@@ -0,0 +1,40 @@
+#!/bin/sh
+
+# Script to generate info.go.
+
+outfile=${1:-/dev/stdout}
+
+cat <<'EOF' > $outfile
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// SetGoogleClientInfo sets the name and version of the application in
+// the `x-goog-api-client` header passed on each request. Also passes any
+// provided key-value pairs. Intended for use by Google-written clients.
+//
+// Internal use only.
+
+package generativelanguage
+
+//go:generate ./gen_info.sh info.go
+
+EOF
+
+awk '/^func \(c \*[A-Z].*\) setGoogleClientInfo/ {
+  printf("func (c %s SetGoogleClientInfo(keyval ...string) {\n", $3);
+	printf("  c.setGoogleClientInfo(keyval...)\n");
+  printf("}\n\n");
+}' *_client.go >> $outfile
+
+gofmt -w $outfile

ai/generativelanguage/apiv1beta/info.go

@@ -20,6 +20,32 @@
 
 package generativelanguage
 
+//go:generate ./gen_info.sh info.go
+
+func (c *DiscussClient) SetGoogleClientInfo(keyval ...string) {
+	c.setGoogleClientInfo(keyval...)
+}
+
+func (c *FileClient) SetGoogleClientInfo(keyval ...string) {
+	c.setGoogleClientInfo(keyval...)
+}
+
 func (c *GenerativeClient) SetGoogleClientInfo(keyval ...string) {
 	c.setGoogleClientInfo(keyval...)
 }
+
+func (c *ModelClient) SetGoogleClientInfo(keyval ...string) {
+	c.setGoogleClientInfo(keyval...)
+}
+
+func (c *PermissionClient) SetGoogleClientInfo(keyval ...string) {
+	c.setGoogleClientInfo(keyval...)
+}
+
+func (c *RetrieverClient) SetGoogleClientInfo(keyval ...string) {
+	c.setGoogleClientInfo(keyval...)
+}
+
+func (c *TextClient) SetGoogleClientInfo(keyval ...string) {
+	c.setGoogleClientInfo(keyval...)
+}