Introduce UNUSED_ANONYMOUS_PARAMETER for anonymous functions

It is not reported for 1.0 language version because
renaming to _ is not possible. It has weak warning severity

So #KT-8813 Fixed
So #KT-16875 Fixed

compiler/testData/diagnostics/tests/syntheticExtensions/samAdapters/GenericClass.kt

@@ -1,6 +1,6 @@
 // FILE: KotlinFile.kt
 fun foo(javaClass: JavaClass<String>): String {
-    return javaClass.doSomething("", 1) { <!UNUSED_PARAMETER!>s<!>: String -> "" }
+    return javaClass.doSomething("", 1) { <!UNUSED_ANONYMOUS_PARAMETER!>s<!>: String -> "" }
 }
 
 // FILE: JavaClass.java