feat: add GPT-4o model and update model tests

Add GPT-4o model with details and update model tests accordingly.

openai-client/openai-client-core/src/commonMain/kotlin/com/tddworks/openai/api/chat/api/Model.kt

@@ -29,6 +29,11 @@ value class Model(val value: String) {
          */
         val GPT_4_TURBO = Model("gpt-4-turbo")
 
+        /**
+         * New GPT-4o Our most advanced, multimodal flagship model that’s cheaper and faster than GPT-4 Turbo. Currently points to gpt-4o-2024-05-13.
+         */
+        val GPT_4O = Model("gpt-4o")
+
         /**
          * GPT-4 model with the ability to understand images, in addition to all other GPT-4 Turbo capabilities.
          * This is a preview model, we recommend developers to now use gpt-4-turbo which includes vision capabilities.

openai-client/openai-client-core/src/jvmTest/kotlin/com/tddworks/openai/api/chat/api/ModelTest.kt

@@ -10,6 +10,11 @@ class ModelTest {
     fun `should return model from value`() {
         assertEquals(Model.GPT_3_5_TURBO, Model("gpt-3.5-turbo"))
         assertEquals(Model.GPT_3_5_TURBO_0125, Model("gpt-3.5-turbo-0125"))
+        assertEquals(Model.GPT_4_TURBO, Model("gpt-4-turbo"))
+        assertEquals(Model.GPT4_VISION_PREVIEW, Model("gpt-4-vision-preview"))
+        assertEquals(Model.GPT_4O, Model("gpt-4o"))
+        assertEquals(Model.DALL_E_2, Model("dall-e-2"))
+        assertEquals(Model.DALL_E_3, Model("dall-e-3"))
     }
 
     @Test
@@ -18,6 +23,7 @@ class ModelTest {
         assertEquals("gpt-3.5-turbo-0125", Model.GPT_3_5_TURBO_0125.value)
         assertEquals("gpt-4-turbo", Model.GPT_4_TURBO.value)
         assertEquals("gpt-4-vision-preview", Model.GPT4_VISION_PREVIEW.value)
+        assertEquals("gpt-4o", Model.GPT_4O.value)
         assertEquals("dall-e-2", Model.DALL_E_2.value)
         assertEquals("dall-e-3", Model.DALL_E_3.value)
     }