Adding some missing writeable types (#106841)

I realized I forgot to add some namedwritables to our registry. I've
forgotten this multiple times.

Any ideas how we can improve this so we get failures if we forget in the
future?

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/InferenceNamedWriteablesProvider.java

@@ -14,7 +14,9 @@ import org.elasticsearch.inference.InferenceServiceResults;
 import org.elasticsearch.inference.SecretSettings;
 import org.elasticsearch.inference.ServiceSettings;
 import org.elasticsearch.inference.TaskSettings;
+import org.elasticsearch.xpack.core.inference.results.ChatCompletionResults;
 import org.elasticsearch.xpack.core.inference.results.ChunkedSparseEmbeddingResults;
+import org.elasticsearch.xpack.core.inference.results.ChunkedTextEmbeddingByteResults;
 import org.elasticsearch.xpack.core.inference.results.ChunkedTextEmbeddingResults;
 import org.elasticsearch.xpack.core.inference.results.ErrorChunkedInferenceResults;
 import org.elasticsearch.xpack.core.inference.results.LegacyTextEmbeddingResults;
@@ -31,6 +33,8 @@ import org.elasticsearch.xpack.inference.services.elser.ElserMlNodeTaskSettings;
 import org.elasticsearch.xpack.inference.services.huggingface.HuggingFaceServiceSettings;
 import org.elasticsearch.xpack.inference.services.huggingface.elser.HuggingFaceElserSecretSettings;
 import org.elasticsearch.xpack.inference.services.huggingface.elser.HuggingFaceElserServiceSettings;
+import org.elasticsearch.xpack.inference.services.openai.completion.OpenAiChatCompletionServiceSettings;
+import org.elasticsearch.xpack.inference.services.openai.completion.OpenAiChatCompletionTaskSettings;
 import org.elasticsearch.xpack.inference.services.openai.embeddings.OpenAiEmbeddingsServiceSettings;
 import org.elasticsearch.xpack.inference.services.openai.embeddings.OpenAiEmbeddingsTaskSettings;
 import org.elasticsearch.xpack.inference.services.settings.DefaultSecretSettings;
@@ -61,6 +65,9 @@ public class InferenceNamedWriteablesProvider {
         namedWriteables.add(
             new NamedWriteableRegistry.Entry(InferenceServiceResults.class, TextEmbeddingByteResults.NAME, TextEmbeddingByteResults::new)
         );
+        namedWriteables.add(
+            new NamedWriteableRegistry.Entry(InferenceServiceResults.class, ChatCompletionResults.NAME, ChatCompletionResults::new)
+        );
 
         // Chunked inference results
         namedWriteables.add(
@@ -84,7 +91,13 @@ public class InferenceNamedWriteablesProvider {
                 ChunkedTextEmbeddingResults::new
             )
         );
-        // TODO add text embedding byte result
+        namedWriteables.add(
+            new NamedWriteableRegistry.Entry(
+                InferenceServiceResults.class,
+                ChunkedTextEmbeddingByteResults.NAME,
+                ChunkedTextEmbeddingByteResults::new
+            )
+        );
 
         // Empty default task settings
         namedWriteables.add(new NamedWriteableRegistry.Entry(TaskSettings.class, EmptyTaskSettings.NAME, EmptyTaskSettings::new));
@@ -142,6 +155,20 @@ public class InferenceNamedWriteablesProvider {
         namedWriteables.add(
             new NamedWriteableRegistry.Entry(TaskSettings.class, OpenAiEmbeddingsTaskSettings.NAME, OpenAiEmbeddingsTaskSettings::new)
         );
+        namedWriteables.add(
+            new NamedWriteableRegistry.Entry(
+                ServiceSettings.class,
+                OpenAiChatCompletionServiceSettings.NAME,
+                OpenAiChatCompletionServiceSettings::new
+            )
+        );
+        namedWriteables.add(
+            new NamedWriteableRegistry.Entry(
+                TaskSettings.class,
+                OpenAiChatCompletionTaskSettings.NAME,
+                OpenAiChatCompletionTaskSettings::new
+            )
+        );
 
         // Cohere
         namedWriteables.add(