cleanup: Removed unused imports (#128)

I found some unused imports in the project. This PR removes them to keep
the code clean.

Signed-off-by: Sun Yuhan <[email protected]>
Co-authored-by: Sun Yuhan <[email protected]>

Author: sunyuhan1998

sdk-jakarta/src/main/java/io/a2a/server/apps/jakarta/A2AServerResource.java

@@ -1,7 +1,6 @@
 package io.a2a.server.apps.jakarta;
 
 import java.util.concurrent.Executor;
-import java.util.concurrent.Executors;
 import java.util.concurrent.Flow;
 
 import jakarta.enterprise.inject.Instance;

sdk-jakarta/src/test/java/io/a2a/server/apps/jakarta/JakartaA2AServerTest.java

@@ -6,8 +6,6 @@
 import io.a2a.server.events.InMemoryQueueManager;
 import io.a2a.server.tasks.TaskStore;
 import io.quarkus.test.junit.QuarkusTest;
-import org.junit.jupiter.api.Disabled;
-import org.junit.jupiter.api.Test;
 
 @QuarkusTest
 public class JakartaA2AServerTest extends AbstractA2AServerTest {

sdk-server-common/src/main/java/io/a2a/server/events/InMemoryQueueManager.java

@@ -3,14 +3,9 @@
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
-import java.util.concurrent.TimeUnit;
 
 import jakarta.enterprise.context.ApplicationScoped;
 
-import io.a2a.server.util.TempLoggerWrapper;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 @ApplicationScoped
 public class InMemoryQueueManager implements QueueManager {
     private final Map<String, EventQueue> queues = Collections.synchronizedMap(new HashMap<>());

sdk-server-common/src/main/java/io/a2a/server/util/async/Internal.java

@@ -2,7 +2,6 @@
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
-import java.lang.annotation.Target;
 
 import jakarta.inject.Qualifier;
 

sdk-server-common/src/test/java/io/a2a/server/events/EventConsumerTest.java

@@ -1,7 +1,6 @@
 package io.a2a.server.events;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.junit.jupiter.api.Assertions.assertSame;
 import static org.junit.jupiter.api.Assertions.assertThrows;