fix native image tests

Author: rahul2393

google-cloud-spanner/src/main/resources/META-INF/native-image/com.google.cloud.spanner/grpc-gcp-reflect-config.json

@@ -0,0 +1,56 @@
+[
+  {
+    "name": "com.google.cloud.grpc.proto.ApiConfig",
+    "allDeclaredFields": true,
+    "allDeclaredMethods": true,
+    "allDeclaredConstructors": true
+  },
+  {
+    "name": "com.google.cloud.grpc.proto.ApiConfig$Builder",
+    "allDeclaredFields": true,
+    "allDeclaredMethods": true,
+    "allDeclaredConstructors": true
+  },
+  {
+    "name": "com.google.cloud.grpc.proto.ChannelPoolConfig",
+    "allDeclaredFields": true,
+    "allDeclaredMethods": true,
+    "allDeclaredConstructors": true
+  },
+  {
+    "name": "com.google.cloud.grpc.proto.ChannelPoolConfig$Builder",
+    "allDeclaredFields": true,
+    "allDeclaredMethods": true,
+    "allDeclaredConstructors": true
+  },
+  {
+    "name": "com.google.cloud.grpc.proto.MethodConfig",
+    "allDeclaredFields": true,
+    "allDeclaredMethods": true,
+    "allDeclaredConstructors": true
+  },
+  {
+    "name": "com.google.cloud.grpc.proto.MethodConfig$Builder",
+    "allDeclaredFields": true,
+    "allDeclaredMethods": true,
+    "allDeclaredConstructors": true
+  },
+  {
+    "name": "com.google.cloud.grpc.proto.AffinityConfig",
+    "allDeclaredFields": true,
+    "allDeclaredMethods": true,
+    "allDeclaredConstructors": true
+  },
+  {
+    "name": "com.google.cloud.grpc.proto.AffinityConfig$Builder",
+    "allDeclaredFields": true,
+    "allDeclaredMethods": true,
+    "allDeclaredConstructors": true
+  },
+  {
+    "name": "com.google.cloud.grpc.proto.AffinityConfig$Command",
+    "allDeclaredFields": true,
+    "allDeclaredMethods": true,
+    "allDeclaredConstructors": true
+  }
+]