Report warning on unused entities that can be renamed to _

Currently it's all about lambda parameters/destructuring entries

 #KT-14347 In Progress

idea/testData/checker/regression/DescructuringDeclarationInForLoop.kt

@@ -1,3 +1,3 @@
 fun main() {
-    for ((i, <warning>j</warning>)<error>)</error> {}
-}
+    for ((<warning>i</warning>, <warning>j</warning>)<error>)</error> {}
+}

idea/testData/checker/regression/Jet124.kt

@@ -3,6 +3,6 @@ fun foo1() :  (Int) -> Int = { x: Int -> x }
 fun foo() {
   val h :  (Int) -> Int = foo1();
   h(1)
-  val m :  (Int) -> Int = {a : Int -> 1}//foo1()
+  val m :  (Int) -> Int = {<warning descr="[UNUSED_PARAMETER] Parameter 'a' is never used">a</warning> : Int -> 1}//foo1()
   m(1)
-}
+}