[Wasm] Add ability to choose flavor for the wasm launcher

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JSCompilerArguments.kt

@@ -235,6 +235,13 @@ class K2JSCompilerArguments : CommonCompilerArguments() {
     @Argument(value = "-Xwasm-debug-info", description = "Add debug info to WebAssembly compiled module")
     var wasmDebug: Boolean by FreezableVar(false)
 
+    @Argument(
+            value = "-Xwasm-launcher",
+            valueDescription = "esm|nodejs",
+            description = "Picks flavor for the wasm launcher. Default is ESM."
+    )
+    var wasmLauncher: String? by NullableStringFreezableVar("esm")
+
     override fun configureLanguageFeatures(collector: MessageCollector): MutableMap<LanguageFeature, LanguageFeature.State> {
         return super.configureLanguageFeatures(collector).apply {
             if (extensionFunctionsInExternals) {