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/shadowing/ShadowMultiDeclarationWithFunParameter.kt

@@ -6,9 +6,9 @@ class A {
 fun foo(a: A, c: Int) {
     val (<!NAME_SHADOWING!>a<!>, b) = a
     val arr = Array(2) { A() }
-    for ((<!NAME_SHADOWING!>c<!>, <!UNUSED_VARIABLE!>d<!>) in arr)  {
-        
+    for ((<!NAME_SHADOWING, UNUSED_VARIABLE!>c<!>, <!UNUSED_VARIABLE!>d<!>) in arr)  {
+
     }
 
     val <!UNUSED_VARIABLE!>e<!> = a.toString() + b + c
-}
+}