MINOR: Fix TargetAssignmentBuilderBenchmark (#22484)

Since KAFKA-20266, TargetAssignmentBuilder requires a Time instance to
timestamp the assignment. Add one to TargetAssignmentBuilderBenchmark.

Reviewers: Chia-Ping Tsai <chia7712@gmail.com>

Author: squah-confluent

jmh-benchmarks/src/main/java/org/apache/kafka/jmh/assignor/TargetAssignmentBuilderBenchmark.java

@@ -17,6 +17,7 @@
 package org.apache.kafka.jmh.assignor;
 
 import org.apache.kafka.common.Uuid;
+import org.apache.kafka.common.utils.Time;
 import org.apache.kafka.coordinator.common.runtime.CoordinatorMetadataImage;
 import org.apache.kafka.coordinator.group.api.assignor.GroupAssignment;
 import org.apache.kafka.coordinator.group.api.assignor.GroupSpec;
@@ -113,6 +114,7 @@ public void setup() {
             .build();
 
         targetAssignmentBuilder = new TargetAssignmentBuilder.ConsumerTargetAssignmentBuilder(GROUP_ID, GROUP_EPOCH, partitionAssignor)
+            .withTime(Time.SYSTEM)
             .withMembers(members)
             .withSubscriptionType(subscriptionType)
             .withTargetAssignment(existingTargetAssignment)