Merge pull request #334 from quarkiverse/#333

Add Content serialization support

openai/openai-common/runtime/src/main/java/io/quarkiverse/langchain4j/openai/runtime/jackson/ContentMixin.java

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+package io.quarkiverse.langchain4j.openai.runtime.jackson;
+
+import com.fasterxml.jackson.annotation.JsonAutoDetect;
+
+import dev.ai4j.openai4j.chat.Content;
+import io.quarkus.jackson.JacksonMixin;
+
+@JacksonMixin(Content.class)
+@JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.ANY, getterVisibility = JsonAutoDetect.Visibility.NONE, setterVisibility = JsonAutoDetect.Visibility.NONE)
+public abstract class ContentMixin {
+}

openai/openai-common/runtime/src/main/java/io/quarkiverse/langchain4j/openai/runtime/jackson/ContentTypeMixin.java

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+package io.quarkiverse.langchain4j.openai.runtime.jackson;
+
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+
+import dev.ai4j.openai4j.chat.ContentType;
+import io.quarkus.jackson.JacksonMixin;
+
+@JacksonMixin(ContentType.class)
+@JsonSerialize(using = ContentTypeSerializer.class)
+public abstract class ContentTypeMixin {
+}

openai/openai-common/runtime/src/main/java/io/quarkiverse/langchain4j/openai/runtime/jackson/ContentTypeSerializer.java

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+package io.quarkiverse.langchain4j.openai.runtime.jackson;
+
+import java.io.IOException;
+import java.util.Locale;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.databind.SerializerProvider;
+import com.fasterxml.jackson.databind.ser.std.StdSerializer;
+
+import dev.ai4j.openai4j.chat.ContentType;
+
+public class ContentTypeSerializer extends StdSerializer<ContentType> {
+    public ContentTypeSerializer() {
+        super(ContentType.class);
+    }
+
+    @Override
+    public void serialize(ContentType value, JsonGenerator gen, SerializerProvider provider) throws IOException {
+        gen.writeString(value.toString().toLowerCase(Locale.ROOT));
+    }
+}

openai/openai-common/runtime/src/main/java/io/quarkiverse/langchain4j/openai/runtime/jackson/ImageUrlMixin.java

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+package io.quarkiverse.langchain4j.openai.runtime.jackson;
+
+import com.fasterxml.jackson.annotation.JsonAutoDetect;
+
+import dev.ai4j.openai4j.chat.ImageUrl;
+import io.quarkus.jackson.JacksonMixin;
+
+@JacksonMixin(ImageUrl.class)
+@JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.ANY, getterVisibility = JsonAutoDetect.Visibility.NONE, setterVisibility = JsonAutoDetect.Visibility.NONE)
+public abstract class ImageUrlMixin {
+}