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/inference/cannotCompleteResolveWithFunctionLiterals.kt

@@ -4,7 +4,7 @@ package f
 fun <R> h(<!UNUSED_PARAMETER!>f<!>: (Boolean) -> R) = 1
 fun <R> h(<!UNUSED_PARAMETER!>f<!>: (String) -> R) = 2
 
-fun test() = <!CANNOT_COMPLETE_RESOLVE!>h<!>{ <!CANNOT_INFER_PARAMETER_TYPE, UNUSED_PARAMETER!>i<!> -> getAnswer() }
+fun test() = <!CANNOT_COMPLETE_RESOLVE!>h<!>{ <!CANNOT_INFER_PARAMETER_TYPE, UNUSED_ANONYMOUS_PARAMETER!>i<!> -> getAnswer() }
 
 fun getAnswer() = 42