Improve support of 'lateinit' modifier

- Allow 'lateinit' for inline classes which underlying type
is suitable for 'lateinit'

- K2: report all problems related to 'lateinit' modifier

^KT-55052: Fixed

compiler/testData/diagnostics/tests/inlineClasses/lateinitInlineClassesOff.kt

@@ -0,0 +1,11 @@
+// !LANGUAGE: +InlineClasses, -JvmInlineValueClasses
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+// FIR_IDENTICAL
+
+inline class Foo(val x: Int)
+
+<!INAPPLICABLE_LATEINIT_MODIFIER!>lateinit<!> var a: Foo
+
+fun foo() {
+    <!INAPPLICABLE_LATEINIT_MODIFIER!>lateinit<!> var b: Foo
+}