Report warning on unused entities that can be renamed to _

Currently it's all about lambda parameters/destructuring entries

 #KT-14347 In Progress

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!>i<!> -> getAnswer() }
+fun test() = <!CANNOT_COMPLETE_RESOLVE!>h<!>{ <!CANNOT_INFER_PARAMETER_TYPE, UNUSED_PARAMETER!>i<!> -> getAnswer() }
 
 fun getAnswer() = 42