Support plugin intrinsics for serializer() function in K2.

- Add IrPluginContext to JvmBackendContext, so plugin intrinsics can
reference external functions properly.

- Do not use module.findClassAcrossModuleDependencies as Descriptor API does not work for FIR.

- Add asm listing tests in serialization plugin for K2

- Remove Delegated.kt asm listing test as we have similar test in boxIr group.

#KT-56553 Fixed

plugins/kotlinx-serialization/testData/boxIr/contextualFallback.kt

@@ -5,6 +5,7 @@
 import kotlinx.serialization.*
 import kotlinx.serialization.json.*
 import kotlinx.serialization.encoding.*
+import kotlin.reflect.typeOf
 
 @Serializable
 data class Holder<T>(
@@ -14,7 +15,7 @@ data class Holder<T>(
 )
 
 fun box(): String {
-    val serializer = serializer<Holder<List<String>>>()
+    val serializer = serializer(typeOf<Holder<List<String>>>())
     val instance = Holder(true, listOf("a", "b"))
     val encoded = Json.encodeToString(serializer, instance)
     if (encoded != """{"ok":true,"result":["a","b"]}""") return encoded