refactor: add new event and model classes, update OpenCodeClient

- Add new event and model classes for better event handling and data representation
- Update `PromptRequest` to include additional fields
- Integrate Lombok annotation processor in Maven configuration
- Simplify `OpenCodeClient` constructor and remove redundant comments

Author: loong10k

README.md

@@ -92,7 +92,24 @@
                     <source>${java.version}</source>
                     <target>${java.version}</target>
                     <encoding>${project.build.sourceEncoding}</encoding>
+                    <annotationProcessorPaths>
+                        <path>
+                            <groupId>org.projectlombok</groupId>
+                            <artifactId>lombok</artifactId>
+                            <version>${lombok.version}</version>
+                        </path>
+                    </annotationProcessorPaths>
+                    <compilerArgs>
+                        <arg>-Xlint:all</arg>
+                    </compilerArgs>
                 </configuration>
+                <dependencies>
+                    <dependency>
+                        <groupId>org.projectlombok</groupId>
+                        <artifactId>lombok</artifactId>
+                        <version>${lombok.version}</version>
+                    </dependency>
+                </dependencies>
             </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>