[FIR] Add aliasSource to FirImport, FirImportImpl

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

@@ -45,7 +45,7 @@ object ImplementationConfigurator : AbstractFirTreeImplementationConfigurator()
         impl(import)
 
         impl(resolvedImport) {
-            delegateFields(listOf("aliasName", "importedFqName", "isAllUnder"), "delegate")
+            delegateFields(listOf("aliasName", "aliasSource", "importedFqName", "isAllUnder"), "delegate")
 
             default("source") {
                 delegate = "delegate"

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

@@ -407,6 +407,7 @@ object NodeConfigurator : AbstractFieldConfigurator<FirTreeBuilder>(FirTreeBuild
             +field("importedFqName", fqNameType, nullable = true)
             +booleanField("isAllUnder")
             +field("aliasName", nameType, nullable = true)
+            +field("aliasSource", sourceElementType, nullable = true)
         }
 
         resolvedImport.configure {