Report "declaration should be marked with impl" when possible

Also support a quick fix to add 'impl' modifier (KT-18454), although it
doesn't work yet on classes because there's no error on them in the IDE

 #KT-18087 Fixed
 #KT-18452 Fixed
 #KT-18454

compiler/testData/diagnostics/tests/multiplatform/headerClass/implDataClass.kt

@@ -25,8 +25,8 @@ header class Baz(w: List<String>) {
 // MODULE: m2-jvm(m1-common)
 // FILE: jvm.kt
 
-impl data class Foo(impl val x: Int, impl val y: String)
+impl data class Foo impl constructor(impl val x: Int, impl val y: String)
 
-impl data class Bar(val z: Double)
+impl data class Bar impl constructor(val z: Double)
 
-impl data class Baz(impl val w: List<String>)
+impl data class Baz impl constructor(impl val w: List<String>)

compiler/testData/diagnostics/tests/multiplatform/headerClass/noImplKeywordOnMember.kt

@@ -9,7 +9,6 @@ header class Foo {
 // MODULE: m2-jvm(m1-common)
 // FILE: jvm.kt
 
-// TODO: run HeaderImplDeclarationChecker on non-impl members of impl classes, and report something like "impl expected" on 'bar' instead
-impl class <!HEADER_CLASS_MEMBERS_ARE_NOT_IMPLEMENTED!>Foo<!> {
-    fun bar(): String = "bar"
+impl class Foo {
+    <!IMPL_MISSING!>fun bar(): String<!> = "bar"
 }

compiler/testData/diagnostics/tests/multiplatform/namedArguments.kt

@@ -20,7 +20,7 @@ fun testCommon() {
 // MODULE: m2-jvm(m1-common)
 // FILE: jvm.kt
 
-impl class Foo(val aaa: Boolean) {
+impl class Foo impl constructor(val aaa: Boolean) {
     impl constructor(zzz: Int) : this(zzz == 0)
 
     impl fun f1(xxx: String) = xxx