refactor: move DataCenterInfo and LeaseInfo classes

Motivation:

Since it is ensured that the public API does not expose the shaded classes, after moving `com.linecorp.armeria.internal.common.eureka.InstanceInfo` to `com.linecorp.armeria.common.eureka.InstanceInfo`, the same exception occurs with the following jobs:
- build-ubicloud-standard-16-jdk-*
- build-macos-latest-jdk-21
- build-windows-latest-jdk-21

```
Execution failed for task ':javadoc:checkJavadoc'.
> java.lang.Exception: Disallowed class(es) in the public API:
  - InstanceInfo -> com.linecorp.armeria.internal.common.eureka.DataCenterInfo
  - InstanceInfo -> com.linecorp.armeria.internal.common.eureka.LeaseInfo
```

Modifications:

- Move `com.linecorp.armeria.internal.common.eureka.DataCenterInfo` to `com.linecorp.armeria.common.eureka.DataCenterInfo`.
- Move `com.linecorp.armeria.internal.common.eureka.LeaseInfo` to `com.linecorp.armeria.common.eureka.LeaseInfo`.
- Make public `com.linecorp.armeria.internal.common.eureka.DataCenterInfoSerializer`

Result:

DataCenterInfo and LeaseInfo classes are now allowed

eureka/src/main/java/com/linecorp/armeria/internal/common/eureka/DataCenterInfo.java → eureka/src/main/java/com/linecorp/armeria/common/eureka/DataCenterInfo.java

@@ -13,7 +13,7 @@
  * License for the specific language governing permissions and limitations
  * under the License.
  */
-package com.linecorp.armeria.internal.common.eureka;
+package com.linecorp.armeria.common.eureka;
 
 import static com.google.common.base.MoreObjects.toStringHelper;
 import static java.util.Objects.requireNonNull;
@@ -27,6 +27,7 @@
 import com.google.common.collect.ImmutableMap;
 
 import com.linecorp.armeria.common.annotation.Nullable;
+import com.linecorp.armeria.internal.common.eureka.DataCenterInfoSerializer;
 
 /**
  * The data center information.
@@ -52,10 +53,20 @@ public DataCenterInfo(@JsonProperty("name") String name,
         }
     }
 
+    /**
+     * Returns the name of the object.
+     *
+     * @return the name of the object
+     */
     public String getName() {
         return name;
     }
 
+    /**
+     * Returns the metadata associated with the object.
+     *
+     * @return a map of key-value pairs representing the metadata
+     */
     public Map<String, String> getMetadata() {
         return metadata;
     }

eureka/src/main/java/com/linecorp/armeria/common/eureka/InstanceInfo.java

@@ -34,8 +34,6 @@
 
 import com.linecorp.armeria.client.Endpoint;
 import com.linecorp.armeria.common.annotation.Nullable;
-import com.linecorp.armeria.internal.common.eureka.DataCenterInfo;
-import com.linecorp.armeria.internal.common.eureka.LeaseInfo;
 
 import io.netty.util.AttributeKey;
 

eureka/src/main/java/com/linecorp/armeria/internal/common/eureka/LeaseInfo.java → eureka/src/main/java/com/linecorp/armeria/common/eureka/LeaseInfo.java

@@ -13,7 +13,7 @@
  * License for the specific language governing permissions and limitations
  * under the License.
  */
-package com.linecorp.armeria.internal.common.eureka;
+package com.linecorp.armeria.common.eureka;
 
 import static com.google.common.base.MoreObjects.toStringHelper;
 import static com.google.common.base.Preconditions.checkArgument;

eureka/src/main/java/com/linecorp/armeria/internal/common/eureka/DataCenterInfoSerializer.java

@@ -23,7 +23,9 @@
 import com.fasterxml.jackson.databind.SerializerProvider;
 import com.fasterxml.jackson.databind.ser.std.StdSerializer;
 
-final class DataCenterInfoSerializer extends StdSerializer<DataCenterInfo> {
+import com.linecorp.armeria.common.eureka.DataCenterInfo;
+
+public final class DataCenterInfoSerializer extends StdSerializer<DataCenterInfo> {
 
     private static final long serialVersionUID = -5766818057428683420L;
 

eureka/src/main/java/com/linecorp/armeria/server/eureka/InstanceInfoBuilder.java

@@ -27,11 +27,11 @@
 
 import com.linecorp.armeria.common.SessionProtocol;
 import com.linecorp.armeria.common.annotation.Nullable;
+import com.linecorp.armeria.common.eureka.DataCenterInfo;
 import com.linecorp.armeria.common.eureka.InstanceInfo;
 import com.linecorp.armeria.common.eureka.InstanceInfo.InstanceStatus;
 import com.linecorp.armeria.common.eureka.InstanceInfo.PortWrapper;
-import com.linecorp.armeria.internal.common.eureka.DataCenterInfo;
-import com.linecorp.armeria.internal.common.eureka.LeaseInfo;
+import com.linecorp.armeria.common.eureka.LeaseInfo;
 
 import io.netty.util.NetUtil;
 

eureka/src/test/java/com/linecorp/armeria/client/eureka/ArmeriaEurekaClientTest.java

@@ -140,9 +140,9 @@ private static com.linecorp.armeria.common.eureka.InstanceInfo convertInstanceIn
                     info.getMetadata());
         }
 
-        private static com.linecorp.armeria.internal.common.eureka.LeaseInfo convertLeaseInfo(
+        private static com.linecorp.armeria.common.eureka.LeaseInfo convertLeaseInfo(
                 LeaseInfo leaseInfo) {
-            return new com.linecorp.armeria.internal.common.eureka.LeaseInfo(
+            return new com.linecorp.armeria.common.eureka.LeaseInfo(
                     leaseInfo.getRenewalIntervalInSecs(),
                     leaseInfo.getDurationInSecs(),
                     leaseInfo.getRegistrationTimestamp(),
@@ -312,15 +312,15 @@ private static Map<String, String> headersOf(ResponseHeaders headers) {
             return result;
         }
 
-        private static com.linecorp.armeria.internal.common.eureka.DataCenterInfo convertDataCenterInfo(
+        private static com.linecorp.armeria.common.eureka.DataCenterInfo convertDataCenterInfo(
                 DataCenterInfo dataCenterInfo) {
             final Map<String, String> metadata;
             if (dataCenterInfo.getName() == Name.Amazon) {
                 metadata = ((AmazonInfo) dataCenterInfo).getMetadata();
             } else {
                 metadata = ImmutableMap.of();
             }
-            return new com.linecorp.armeria.internal.common.eureka.DataCenterInfo(
+            return new com.linecorp.armeria.common.eureka.DataCenterInfo(
                     dataCenterInfo.getName().name(), metadata);
         }
 

eureka/src/test/java/com/linecorp/armeria/common/eureka/InstanceInfoTest.java

@@ -25,8 +25,6 @@
 import com.linecorp.armeria.client.Endpoint;
 import com.linecorp.armeria.common.eureka.InstanceInfo.InstanceStatus;
 import com.linecorp.armeria.common.eureka.InstanceInfo.PortWrapper;
-import com.linecorp.armeria.internal.common.eureka.DataCenterInfo;
-import com.linecorp.armeria.internal.common.eureka.LeaseInfo;
 
 class InstanceInfoTest {
 
@@ -90,8 +88,8 @@ void getShouldReturnAssociatedInstanceInfo() {
         assertThat(instanceInfoRetrieved.getStatusPageUrl()).isEqualTo(statusPageUrl);
         assertThat(instanceInfoRetrieved.getHealthCheckUrl()).isEqualTo(healthCheckUrl);
         assertThat(instanceInfoRetrieved.getSecureHealthCheckUrl()).isEqualTo(secureHealthCheckUrl);
-        //assertThat(instanceInfoRetrieved.getDataCenterInfo()).isEqualTo(dataCenterInfo);
-        //assertThat(instanceInfoRetrieved.getLeaseInfo()).isEqualTo(leaseInfo);
+        assertThat(instanceInfoRetrieved.getDataCenterInfo()).isEqualTo(dataCenterInfo);
+        assertThat(instanceInfoRetrieved.getLeaseInfo()).isEqualTo(leaseInfo);
         assertThat(instanceInfoRetrieved.getMetadata()).isEqualTo(metadata);
     }
 }