K2 Scripting, Fir2Ir: allow out of order supertypes declaration

fix script declarations registration logic in Fir2Ir to allow
supertypes of a class to be defined later than the class itself.

#KT-64534 fixed

compiler/testData/codegen/box/script/outOuOrderDecls.kt

@@ -0,0 +1,14 @@
+// TARGET_BACKEND: JVM
+// IGNORE_LIGHT_ANALYSIS
+// JVM_ABI_K1_K2_DIFF: KT-63963, KT-63964, KT-63960
+// FILE: test.kt
+
+fun box(): String = "OK"
+
+// FILE: script.kts
+
+class A : B, C {}
+
+interface B
+
+interface C