feat: Google Cloud TTS 사용을 위한 클라이언트 설정 및 상수 정의

src/main/kotlin/com/sangdol/text_to_speech/GoogleTtsConfig.kt

@@ -0,0 +1,44 @@
+package com.sangdol.text_to_speech
+
+import com.google.cloud.texttospeech.v1.TextToSpeechClient
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+
+@Configuration
+class GoogleTtsConfig {
+
+    @Bean
+    fun textToSpeechClient(): TextToSpeechClient = TextToSpeechClient.create()
+}
+
+enum class TtsLanguageCode(
+    val code: String
+) {
+    ENGLISH_US("en-US")
+}
+
+sealed interface VoiceType {
+    val identifier: String
+    val name: String
+}
+
+enum class Neural2MaleVoice(
+    override val identifier: String,
+): VoiceType {
+    TYPE_A("en-US-Neural2-A"),
+    TYPE_D("en-US-Neural2-D"),
+    TYPE_I("en-US-Neural2-I"),
+    TYPE_J("en-US-Neural2-J"),
+    ;
+}
+
+enum class Neural2FemaleVoice(
+    override val identifier: String
+): VoiceType {
+    TYPE_C("en-US-Neural2-C"),
+    TYPE_E("en-US-Neural2-E"),
+    TYPE_F("en-US-Neural2-F"),
+    TYPE_G("en-US-Neural2-G"),
+    TYPE_H("en-US-Neural2-H"),
+    ;
+}