[Wasm] Add JsModule checker to K2

#KT-56849

compiler/testData/diagnostics/wasmTests/jsInterop/module/nestedProhibited.kt

@@ -0,0 +1,17 @@
+// FIR_IDENTICAL
+@file:JsModule("foo")
+package foo
+
+@JsModule("A")
+external class <!NESTED_JS_MODULE_PROHIBITED!>A<!> {
+    class Nested
+}
+
+@JsModule("B")
+external <!NESTED_JS_MODULE_PROHIBITED!>object B<!>
+
+<!NESTED_JS_MODULE_PROHIBITED!>@JsModule("foo")
+external fun foo(): Int<!>
+
+<!NESTED_JS_MODULE_PROHIBITED!>@JsModule("bar")
+external val bar: Int<!>