[Wasm] Imporove external interface support

* Support boxing/unboxing when casting to Any
* Support ===, equals, hashCode, toString

* Support adapting String in interop boundary

js/js.tests/test/org/jetbrains/kotlin/js/test/BasicWasmBoxTest.kt

@@ -195,7 +195,7 @@ abstract class BasicWasmBoxTest(
             
             wasmInstance.exports.startUnitTests?.();
 
-            const actualResult = importStringFromWasm(wasmInstance.exports.$testFunction());
+            const actualResult = wasmInstance.exports.$testFunction();
             if (actualResult !== "OK")
                 throw `Wrong box result '${'$'}{actualResult}'; Expected "OK"`;
         """.trimIndent()

js/js.tests/test/org/jetbrains/kotlin/js/test/ir/semantics/abstractClassesForGeneratedIrTests.kt

@@ -23,3 +23,9 @@ abstract class AbstractIrJsCodegenInlineTest : BasicIrBoxTest(
     "compiler/testData/codegen/boxInline/",
     "codegen/irBoxInline/"
 )
+
+
+abstract class AbstractIrCodegenWasmJsInteropJsTest : BasicIrBoxTest(
+    "compiler/testData/codegen/wasmJsInterop",
+    "codegen/wasmJsInteropJs"
+)

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/abstractClassesForGeneratedTests.kt

@@ -24,11 +24,6 @@ abstract class AbstractJsCodegenInlineTest : BasicBoxTest(
     "codegen/boxInline"
 )
 
-abstract class AbstractIrCodegenWasmJsInteropJsTest : BasicBoxTest(
-    "compiler/testData/codegen/wasmJsInterop",
-    "codegen/wasmJsInteropWasm"
-)
-
 
 abstract class AbstractJsLegacyPrimitiveArraysBoxTest : BasicBoxTest(
     "compiler/testData/codegen/box/arrays/",