feat/#9: ApiFactory 추가

app/src/main/java/com/sopt/now/test/data/ApiFactory.kt

@@ -0,0 +1,24 @@
+package com.sopt.now.test.data
+
+import com.jakewharton.retrofit2.converter.kotlinx.serialization.asConverterFactory
+import com.sopt.now.BuildConfig
+import kotlinx.serialization.json.Json
+import okhttp3.MediaType.Companion.toMediaType
+import retrofit2.Retrofit
+
+object ApiFactory {
+    private const val BASE_URL: String = BuildConfig.AUTH_BASE_URL
+
+    val retrofit: Retrofit by lazy {
+        Retrofit.Builder()
+            .baseUrl(BASE_URL)
+            .addConverterFactory(Json.asConverterFactory("application/json".toMediaType()))
+            .build()
+    }
+
+    inline fun <reified T> create(): T = retrofit.create(T::class.java)
+}
+
+object ServicePool {
+    val authService = ApiFactory.create<AuthService>()
+}