Add coroutine continuation wrapper for easier use from Java

Author: abnegate

templates/android/library/src/main/java/io/appwrite/coroutines/Callback.kt.twig

@@ -0,0 +1,18 @@
+package {{ sdk.namespace | caseDot }}.coroutines
+
+import kotlinx.coroutines.Dispatchers
+import kotlin.coroutines.Continuation
+import kotlin.coroutines.CoroutineContext
+
+interface Callback<T> {
+    fun onComplete(result: T?, error: Throwable?)
+}
+
+class CoroutineCallback<T> @JvmOverloads constructor(
+    private val callback: Callback<T>,
+    override val context: CoroutineContext = Dispatchers.Default
+) : Continuation<T> {
+    override fun resumeWith(result: Result<T>) {
+        callback.onComplete(result.getOrNull(), result.exceptionOrNull())
+    }
+}

templates/kotlin/src/main/kotlin/io/appwrite/coroutines/Callback.kt.twig

@@ -0,0 +1,18 @@
+package {{ sdk.namespace | caseDot }}.coroutines
+
+import kotlinx.coroutines.Dispatchers
+import kotlin.coroutines.Continuation
+import kotlin.coroutines.CoroutineContext
+
+interface Callback<T> {
+    fun onComplete(result: T?, error: Throwable?)
+}
+
+class CoroutineCallback<T> @JvmOverloads constructor(
+    private val callback: Callback<T>,
+    override val context: CoroutineContext = Dispatchers.Default
+) : Continuation<T> {
+    override fun resumeWith(result: Result<T>) {
+        callback.onComplete(result.getOrNull(), result.exceptionOrNull())
+    }
+}