[Wasm] Support external vararg

Initial implementation copies Wasm array to JS array and spreads it

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/fir/FirJsCodegenWasmJsInteropTestGenerated.java

@@ -84,4 +84,10 @@ public class FirJsCodegenWasmJsInteropTestGenerated extends AbstractFirJsCodegen
     public void testTypes() throws Exception {
         runTest("compiler/testData/codegen/boxWasmJsInterop/types.kt");
     }
+
+    @Test
+    @TestMetadata("vararg.kt")
+    public void testVararg() throws Exception {
+        runTest("compiler/testData/codegen/boxWasmJsInterop/vararg.kt");
+    }
 }

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/IrCodegenWasmJsInteropJsTestGenerated.java

@@ -84,4 +84,10 @@ public class IrCodegenWasmJsInteropJsTestGenerated extends AbstractIrCodegenWasm
     public void testTypes() throws Exception {
         runTest("compiler/testData/codegen/boxWasmJsInterop/types.kt");
     }
+
+    @Test
+    @TestMetadata("vararg.kt")
+    public void testVararg() throws Exception {
+        runTest("compiler/testData/codegen/boxWasmJsInterop/vararg.kt");
+    }
 }

js/js.tests/tests-gen/org/jetbrains/kotlin/js/testOld/wasm/semantics/IrCodegenWasmJsInteropWasmTestGenerated.java

@@ -100,6 +100,11 @@ public class IrCodegenWasmJsInteropWasmTestGenerated extends AbstractIrCodegenWa
         runTest("compiler/testData/codegen/boxWasmJsInterop/types.kt");
     }
 
+    @TestMetadata("vararg.kt")
+    public void testVararg() throws Exception {
+        runTest("compiler/testData/codegen/boxWasmJsInterop/vararg.kt");
+    }
+
     @TestMetadata("wasmImport.kt")
     public void testWasmImport() throws Exception {
         runTest("compiler/testData/codegen/boxWasmJsInterop/wasmImport.kt");