FIR checker: introduce top-level property checkers

Also, refactor property initializer checking so that those
newly added property checkers as well as member property checker
can share the same logic

compiler/testData/diagnostics/tests/delegatedProperty/inTrait.fir.kt

@@ -3,7 +3,7 @@
 import kotlin.reflect.KProperty
 
 interface T {
-  val a: Int by Delegate()
+  val a: Int by <!DELEGATED_PROPERTY_IN_INTERFACE!>Delegate()<!>
 }
 
 class Delegate {