[FIR] add replaceStatements to FirScript

It is required to implement StateKeeper for scripts
statements should be MutableOrEmptyList to avoid CME

^KT-60728
^KT-60519

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/NodeConfigurator.kt

@@ -489,7 +489,7 @@ object NodeConfigurator : AbstractFieldConfigurator<FirTreeBuilder>(FirTreeBuild
 
         script.configure {
             +name
-            +fieldList(statement).withTransform()
+            +fieldList(statement, withReplace = true, useMutableOrEmpty = true).withTransform()
             +symbol("FirScriptSymbol")
             +fieldList("parameters", variable, withReplace = false)
             +fieldList(contextReceiver, useMutableOrEmpty = true)