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/Shadowing.kt

@@ -5,15 +5,15 @@ class A {
 
 fun arrayA(): Array<A> = null!!
 
-fun foo(a: A, <warning>c</warning>: Int) {
-    val (<warning descr="[NAME_SHADOWING] Name shadowed: a">a</warning>, <warning>b</warning>) = a
+fun foo(a: A, <warning descr="[UNUSED_PARAMETER] Parameter 'c' is never used">c</warning>: Int) {
+    val (<warning descr="[NAME_SHADOWING] Name shadowed: a"><warning descr="[UNUSED_VARIABLE] Variable 'a' is never used">a</warning></warning>, <warning descr="[UNUSED_VARIABLE] Variable 'b' is never used">b</warning>) = a
     val arr = arrayA()
-    for ((<warning descr="[NAME_SHADOWING] Name shadowed: c">c</warning>, <warning>d</warning>) in arr) {
+    for ((<warning descr="[NAME_SHADOWING] Name shadowed: c"><warning descr="[UNUSED_VARIABLE] Variable 'c' is never used">c</warning></warning>, <warning descr="[UNUSED_VARIABLE] Variable 'd' is never used">d</warning>) in arr) {
     }
 }
 
-fun f(<warning>p</warning>: Int): Int {
-    val <error>p</error> = 2
-    val <error>p</error> = 3
+fun f(<warning descr="[UNUSED_PARAMETER] Parameter 'p' is never used">p</warning>: Int): Int {
+    val <error descr="">p</error> = 2
+    val <error descr="">p</error> = 3
     return p
-}
+}

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)
-}
+}