FIR: rename FirResolvedImport.resolvedClassId|relativeClassName

These two fields references the parent of the import rather than the
classes that are imported. For example

```
import java.util.Map // resolvedClassId -> null
import java.util.Map.Entry // resolvedClassId -> java.util.Map
import java.util.Map.* // resolvedClassId -> java.util.Map
import java.util.Map.someStaticMethod // resolvedClassId -> java.util.Map
import kotlin.package.someTopLevelFuntion // resolvedClassId -> null
import kotlin.package.MyObject.someObjectFuntion // resolvedClassId -> kotlin.package.MyObject
```

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/scopes/KtFirNonStarImportingScope.kt

@@ -34,8 +34,8 @@ internal class KtFirNonStarImportingScope(
                 imports.forEach { import ->
                     NonStarImport(
                         import.packageFqName,
-                        import.relativeClassName,
-                        import.resolvedClassId,
+                        import.relativeParentClassName,
+                        import.resolvedParentClassId,
                         import.importedName
                     ).let(::add)
                 }

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/scopes/KtFirStarImportingScope.kt

@@ -42,8 +42,8 @@ internal class KtFirStarImportingScope(
         firScope.starImports.map { import ->
             StarImport(
                 import.packageFqName,
-                import.relativeClassName,
-                import.resolvedClassId
+                import.relativeParentClassName,
+                import.resolvedParentClassId
             )
         }
     }