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/testsWithStdLib/annotations/JvmSyntheticOnDelegate.kt

@@ -1,3 +1,4 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
 import kotlin.properties.Delegates
 
 class My {
@@ -6,4 +7,4 @@ class My {
     // Both Ok
     @get:JvmSynthetic val t: String by lazy { "t" }
     @set:JvmSynthetic var z: String by Delegates.observable("?") { prop, old, new -> old.hashCode() }
-}
+}

compiler/testData/diagnostics/testsWithStdLib/annotations/Volatile.kt

@@ -1,3 +1,4 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
 import kotlin.jvm.Volatile
 import kotlin.properties.Delegates
 
@@ -9,4 +10,4 @@ class My {
     <!VOLATILE_ON_DELEGATE!>@delegate:Volatile<!> var z: String by Delegates.observable("?") { prop, old, new -> old.hashCode() }
 
     <!VOLATILE_ON_VALUE!>@field:Volatile<!> val w = 2
-}
+}