test: adding native image resource configuration file for test (#755)

Author: suztomo

google-cloud-speech/src/test/resources/META-INF/native-image/resource-config.json

@@ -0,0 +1,7 @@
+{
+  "resources": {
+    "includes": [
+      {"pattern": ".*.flac"}
+    ]
+  }
+}