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/functionAsExpression/Parameters.kt

@@ -1,4 +1,4 @@
-// !DIAGNOSTICS: -UNUSED_PARAMETER -UNUSED_VARIABLE
+// !DIAGNOSTICS: -UNUSED_PARAMETER -UNUSED_ANONYMOUS_PARAMETER -UNUSED_VARIABLE
 
 val bar = fun(p: Int = <!ANONYMOUS_FUNCTION_PARAMETER_WITH_DEFAULT_VALUE!>3<!>) {}
 val bas = fun(<!USELESS_VARARG_ON_PARAMETER!>vararg p: Int<!>) {}