RawFirBuilder refactoring

Second step for KT-52615
Get rid of PsiHandlingMode
Get rid of source in FirLazyBlock
Refactor lazy creation

Merge-request: KT-MR-7753
Merged-by: Egor Kulikov <Egor.Kulikov@jetbrains.com>

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

@@ -142,6 +142,10 @@ object ImplementationConfigurator : AbstractFirTreeImplementationConfigurator()
 
         impl(block, "FirLazyBlock") {
             val error = """error("FirLazyBlock should be calculated before accessing")"""
+            default("source") {
+                value = error
+                withGetter = true
+            }
             default("statements") {
                 value = error
                 withGetter = true