remove unneeded class heirarchy

Author: David Motsonashvili

firebase-ai/src/main/kotlin/com/google/firebase/ai/type/FunctionDeclaration.kt

@@ -67,6 +67,6 @@ public class FunctionDeclaration(
   internal data class Internal(
     val name: String,
     val description: String,
-    val parameters: Schema.Internal
+    val parameters: Schema.InternalOpenAPI
   )
 }

firebase-ai/src/main/kotlin/com/google/firebase/ai/type/GenerationConfig.kt

@@ -216,7 +216,7 @@ private constructor(
     @SerialName("response_mime_type") val responseMimeType: String? = null,
     @SerialName("presence_penalty") val presencePenalty: Float? = null,
     @SerialName("frequency_penalty") val frequencyPenalty: Float? = null,
-    @SerialName("response_schema") val responseSchema: Schema.Internal? = null,
+    @SerialName("response_schema") val responseSchema: Schema.InternalOpenAPI? = null,
     @SerialName("response_modalities") val responseModalities: List<String>? = null,
     @SerialName("thinking_config") val thinkingConfig: ThinkingConfig.Internal? = null
   )

firebase-ai/src/main/kotlin/com/google/firebase/ai/type/Schema.kt

@@ -417,7 +417,7 @@ internal constructor(
     val type: String? = null,
     val description: String? = null,
     val format: String? = null,
-    val nullable: Boolean? = fals"e,
+    val nullable: Boolean? = false,
     val enum: List<String>? = null,
     val properties: Map<String, InternalOpenAPI>? = null,
     val required: List<String>? = null,

firebase-ai/src/test/java/com/google/firebase/ai/type/FunctionDeclarationTest.kt

@@ -18,12 +18,10 @@ package com.google.firebase.ai.type
 
 import io.kotest.assertions.json.shouldEqualJson
 import kotlinx.serialization.encodeToString
-import kotlinx.serialization.json.ClassDiscriminatorMode
 import kotlinx.serialization.json.Json
 import org.junit.Test
 
 internal class FunctionDeclarationTest {
-  internal val JSON = Json { classDiscriminatorMode = ClassDiscriminatorMode.NONE }
 
   @Test
   fun `Basic FunctionDeclaration with name, description and parameters`() {
@@ -55,7 +53,7 @@ internal class FunctionDeclarationTest {
     """
         .trimIndent()
 
-    JSON.encodeToString(functionDeclaration.toInternal()).shouldEqualJson(expectedJson)
+    Json.encodeToString(functionDeclaration.toInternal()).shouldEqualJson(expectedJson)
   }
 
   @Test
@@ -97,6 +95,6 @@ internal class FunctionDeclarationTest {
     """
         .trimIndent()
 
-    JSON.encodeToString(functionDeclaration.toInternal()).shouldEqualJson(expectedJson)
+    Json.encodeToString(functionDeclaration.toInternal()).shouldEqualJson(expectedJson)
   }
 }