[WASM] Introduce internal ExperimentalNativeApi

To be able to OptIn usages in shared native-wasm directory.

libraries/stdlib/wasm/src/kotlin/text/regex/ExperimentalNativeApi.kt

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package kotlin.experimental
+
+import kotlin.annotation.AnnotationTarget.*
+
+/**
+ * This annotation marks the Kotlin/Native-only standard library API that is considered experimental and is not subject to the
+ * [general compatibility guarantees](https://kotlinlang.org/docs/reference/evolution/components-stability.html) given for the standard library:
+ * the behavior of such API may be changed or the API may be removed completely in any further release.
+ *
+ * This is an internal copy of the public K/N annotation.
+ * It is used to [OptIn] experimental K/N API used in the shared native-wasm directory.
+ */
+@RequiresOptIn(level = RequiresOptIn.Level.WARNING)
+@Retention(AnnotationRetention.BINARY)
+@Target(
+    AnnotationTarget.CLASS,
+    AnnotationTarget.ANNOTATION_CLASS,
+    AnnotationTarget.PROPERTY,
+    AnnotationTarget.FIELD,
+    AnnotationTarget.LOCAL_VARIABLE,
+    AnnotationTarget.VALUE_PARAMETER,
+    AnnotationTarget.CONSTRUCTOR,
+    AnnotationTarget.FUNCTION,
+    AnnotationTarget.PROPERTY_GETTER,
+    AnnotationTarget.PROPERTY_SETTER,
+    AnnotationTarget.TYPEALIAS
+)
+@MustBeDocumented
+@SinceKotlin("1.9")
+internal annotation class ExperimentalNativeApi