Introduce synthetic scope for constructors of fun interfaces

#KT-37434 Fixed

compiler/testData/diagnostics/testsWithJsStdLib/funConstructorCallJS.kt

@@ -0,0 +1,10 @@
+fun interface Foo<T> {
+    fun invoke(): T
+}
+
+fun test() {
+    Foo { }
+    Foo<Unit> { }
+    Foo<String> <!TYPE_MISMATCH!>{ }<!>
+    Foo<String> { "" }
+}

compiler/testData/diagnostics/testsWithJsStdLib/funConstructorCallJS.txt

@@ -0,0 +1,10 @@
+package
+
+public fun test(): kotlin.Unit
+
+public fun interface Foo</*0*/ T> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public abstract fun invoke(): T
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}