Move data objects into separate openai-api package

People can import this if they want to make their own client or don't like retrofit

example/build.gradle

@@ -6,5 +6,5 @@ application {
 }
 
 dependencies {
-    implementation project(":openai")
+    implementation project(":openai-client")
 }

openai-api/build.gradle

@@ -0,0 +1,6 @@
+apply plugin: 'java-library'
+
+dependencies {
+    compileOnly 'org.projectlombok:lombok:1.18.12'
+    annotationProcessor 'org.projectlombok:lombok:1.18.12'
+}

openai-client/build.gradle

@@ -1,6 +1,7 @@
 apply plugin: 'java-library'
 
 dependencies {
+    api project(":openai-api")
     api 'com.squareup.retrofit2:retrofit:2.9.0'
     implementation 'com.squareup.retrofit2:adapter-rxjava2:2.9.0'
     implementation 'com.squareup.retrofit2:converter-jackson:2.9.0'

settings.gradle

@@ -1,5 +1,6 @@
 rootProject.name = 'openai-java'
 
-include ':openai'
-include ':example'
+include 'example'
+include 'openai-api'
+include 'openai-client'