Add shortcut to set API key (#2052)

Add shortcut to set API key

temporal-serviceclient/src/main/java/io/temporal/serviceclient/ServiceStubsOptions.java

@@ -25,6 +25,8 @@
 import com.uber.m3.tally.Scope;
 import io.grpc.*;
 import io.grpc.netty.shaded.io.netty.handler.ssl.SslContext;
+import io.temporal.authorization.AuthorizationGrpcMetadataProvider;
+import io.temporal.authorization.AuthorizationTokenSupplier;
 import java.time.Duration;
 import java.util.ArrayList;
 import java.util.Collection;
@@ -508,6 +510,23 @@ public T addGrpcMetadataProvider(GrpcMetadataProvider grpcMetadataProvider) {
       return self();
     }
 
+    /**
+     * Add a {@link AuthorizationGrpcMetadataProvider} to the gRPC metadata providers that supplies
+     * an authentication token on each gRPC request.
+     *
+     * @param apiKey authentication token supplier to be called on each gRPC request. SDK will
+     *     automatically add the "Bearer " prefix.
+     * @return {@code this}
+     */
+    public T addApiKey(AuthorizationTokenSupplier apiKey) {
+      addGrpcMetadataProvider(
+          new AuthorizationGrpcMetadataProvider(
+              () -> {
+                return "Bearer " + apiKey.supply();
+              }));
+      return self();
+    }
+
     /**
      * @param grpcMetadataProviders gRPC metadata/headers providers to be called on each gRPC
      *     request to supply additional headers