feat: add EchoRequester to java

Author: millotp

clients/algoliasearch-client-java-2/algoliasearch-core/com/algolia/ApiCallback.java

@@ -16,11 +16,7 @@ public interface ApiCallback<T> {
    * @param statusCode Status code of the response if available, otherwise it would be 0
    * @param responseHeaders Headers of the response if available, otherwise it would be null
    */
-  void onFailure(
-    ApiException e,
-    int statusCode,
-    Map<String, List<String>> responseHeaders
-  );
+  void onFailure(ApiException e, int statusCode, Map<String, List<String>> responseHeaders);
 
   /**
    * This is called when the API call succeeded.
@@ -29,11 +25,7 @@ void onFailure(
    * @param statusCode Status code of the response
    * @param responseHeaders Headers of the response
    */
-  void onSuccess(
-    T result,
-    int statusCode,
-    Map<String, List<String>> responseHeaders
-  );
+  void onSuccess(T result, int statusCode, Map<String, List<String>> responseHeaders);
 
   /**
    * This is called when the API upload processing.