feat(spanner): proto columns samples

Author: bshaffer

spanner/composer.json

@@ -1,5 +1,19 @@
 {
     "require": {
-        "google/cloud-spanner": "^1.74"
-    }
+        "google/cloud-spanner": "1.200",
+        "google/gax": "dev-result-function as 1.40.0"
+    },
+    "autoload": {
+        "psr-4": {
+            "GPBMetadata\\": "generated/GPBMetadata",
+            "Testing\\": "generated/Testing"
+        }
+    },
+    "repositories": [
+        {
+            "type": "path",
+            "url": "../../google-cloud-php/Spanner",
+            "options": { "versions": { "google/cloud-spanner":"1.200.0"} }
+        }
+    ]
 }

spanner/data/user.pb

@@ -0,0 +1,14 @@
+
+�
+data/user.prototesting.data"�

+User
+id
 
(Rid
+name 
(	Rname
+active 
(Ractive4
+address 
(2.testing.data.User.AddressRaddress3
+Address
+city
 
(	Rcity
+state 
(	Rstate"4
+Book
+title
 
(	Rtitle
+author 
(	Rauthorbproto3

spanner/data/user.proto

@@ -0,0 +1,42 @@
+// Copyright 2025 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
+//
+//     https://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.
+
+syntax = "proto3";
+
+package testing.data;
+
+message User {
+
+  int64 id = 1;
+
+  string name = 2;
+
+  bool active = 3;
+
+  message Address {
+
+    string city = 1;
+
+    string state = 2;
+  }
+
+  Address address = 4;
+}
+
+
+message Book {
+  string title = 1;
+
+  string author = 2;
+}