[FIR] Implement deprecation for implementing var by inherited val

#KT-56779 Fixed

core/compiler.common/src/org/jetbrains/kotlin/util/ImplementationStatus.kt

@@ -10,6 +10,9 @@ enum class ImplementationStatus {
     /** This symbol is not implemented and should be implemented if the class is not abstract. */
     NOT_IMPLEMENTED,
 
+    /** This symbol is a var property but only has a val property as implementation */
+    VAR_IMPLEMENTED_BY_VAL,
+
     /** The symbol is inheriting multiple non-abstract symbols and hence must be explicitly implemented. */
     AMBIGUOUSLY_INHERITED,