Add JavaPublicApiTests with Java code samples for RequestOptions

Author: andrewheard

firebase-vertexai/src/test/java/com/google/firebase/vertexai/api/java/JavaPublicApiTests.java

@@ -0,0 +1,15 @@
+package com.google.firebase.vertexai.api.java;
+
+import com.google.firebase.vertexai.type.ApiVersion;
+import com.google.firebase.vertexai.type.RequestOptions;
+
+/** Build tests for the Vertex AI in Firebase Java public API surface. */
+final class JavaPublicApiTests {
+  /** {@link RequestOptions} API */
+  void requestOptionsCodeSamples() {
+    new RequestOptions();
+    new RequestOptions(30_000L);
+    new RequestOptions(ApiVersion.V1);
+    new RequestOptions(60_000L, ApiVersion.V1BETA);
+  }
+}