Fix CSM resources load for all Kotlin versions (#152)

Author: Mr3zee

build.gradle.kts

@@ -15,6 +15,13 @@ plugins {
     alias(libs.plugins.binary.compatibility.validator)
 }
 
+// useful for dependencies introspection
+// run ./gradlew htmlDependencyReport
+// Report can normally be found in build/reports/project/dependencies/index.html
+allprojects {
+    plugins.apply("project-report")
+}
+
 object Const {
     const val INTERNAL_RPC_API_ANNOTATION = "kotlinx.rpc.internal.InternalRPCApi"
 }

compiler-plugin/compiler-plugin-backend/src/main/core/kotlinx/rpc/codegen/extension/RPCDeclarationScanner.kt

@@ -2,13 +2,16 @@
  * Copyright 2023-2024 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
  */
 
+@file:OptIn(UnsafeDuringIrConstructionAPI::class)
+
 package kotlinx.rpc.codegen.extension
 
 import kotlinx.rpc.codegen.common.RpcNames
 import org.jetbrains.kotlin.ir.declarations.IrClass
 import org.jetbrains.kotlin.ir.declarations.IrDeclaration
 import org.jetbrains.kotlin.ir.declarations.IrProperty
 import org.jetbrains.kotlin.ir.declarations.IrSimpleFunction
+import org.jetbrains.kotlin.ir.symbols.UnsafeDuringIrConstructionAPI
 import org.jetbrains.kotlin.ir.types.classOrNull
 import org.jetbrains.kotlin.ir.util.dumpKotlinLike