[FIR] Add 'buildCodeFragmentCopy()' and 'replaceBlock()' for IDE analysis

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

@@ -370,6 +370,10 @@ object BuilderConfigurator : AbstractBuilderConfigurator<FirTreeBuilder>(FirTree
             withCopy()
         }
 
+        builder(codeFragment) {
+            withCopy()
+        }
+
         builder(resolvedQualifier) {
             parents += abstractResolvedQualifierBuilder
             defaultFalse("isNullableLHSForCallableReference", "isFullyQualified")

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

@@ -497,7 +497,7 @@ object NodeConfigurator : AbstractFieldConfigurator<FirTreeBuilder>(FirTreeBuild
 
         codeFragment.configure {
             +symbol("FirCodeFragmentSymbol")
-            +field(block).withTransform()
+            +field(block, withReplace = true).withTransform()
         }
 
         packageDirective.configure {