Implement ApiName.equals/.hashCode (#5302)

Co-authored-by: Anirudh <anirudh93@gmail.com>

.changes/next-release/bugfix-AWSSDKforJavav2-ffd0ebe.json

@@ -0,0 +1,6 @@
+{
+    "type": "bugfix",
+    "category": "AWS SDK for Java v2",
+    "contributor": "brettkail-wk",
+    "description": "Implement `ApiName.equals`/`.hashCode`"
+}

core/sdk-core/src/main/java/software/amazon/awssdk/core/ApiName.java

@@ -17,6 +17,7 @@
 
 import static software.amazon.awssdk.utils.Validate.notNull;
 
+import java.util.Objects;
 import software.amazon.awssdk.annotations.SdkPublicApi;
 
 /**
@@ -42,6 +43,30 @@ public String version() {
         return version;
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+
+        ApiName that = (ApiName) o;
+
+        if (!Objects.equals(name, that.name)) {
+            return false;
+        }
+        return Objects.equals(version, that.version);
+    }
+
+    @Override
+    public int hashCode() {
+        int result = name != null ? name.hashCode() : 0;
+        result = 31 * result + (version != null ? version.hashCode() : 0);
+        return result;
+    }
+
     public static Builder builder() {
         return new BuilderImpl();
     }

core/sdk-core/src/test/java/software/amazon/awssdk/core/ApiNameTest.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License").
+ * You may not use this file except in compliance with the License.
+ * A copy of the License is located at
+ *
+ *  http://aws.amazon.com/apache2.0
+ *
+ * or in the "license" file accompanying this file. This file is distributed
+ * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ * express or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+package software.amazon.awssdk.core;
+
+import nl.jqno.equalsverifier.EqualsVerifier;
+import org.junit.jupiter.api.Test;
+
+public class ApiNameTest {
+
+    @Test
+    public void equalsHashCode() {
+        EqualsVerifier.forClass(ApiName.class)
+                      .withNonnullFields("name", "version")
+                      .verify();
+    }
+}