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/regressions/kt2841.kt

@@ -9,7 +9,7 @@ public inline fun <T: Closeable, R> T.use1(block: (T)-> R) : R {
 
 fun main(args: Array<String>) {
     C().use1 {
-        w ->  // ERROR here
+        <!UNUSED_PARAMETER!>w<!> ->  // ERROR here
         <!UNRESOLVED_REFERENCE!>x<!>
     }
-}
+}