K2: add package FQ name to ClassId of anonymous objects

This is needed because in order to figure out which declarations are
visible from anonymous objects in terms of overridability (see
`FirVisibilityChecker.isVisibleForOverriding`), we need to get the
package name of that anonymous object, because there's package-private
visibility on JVM.

 #KT-62017 Fixed

analysis/low-level-api-fir/testData/partialRawBuilder/paramemtersCatching.txt

@@ -1,6 +1,6 @@
 public? final? fun test/classes/Outer.foo(): R|kotlin/Unit| {
     lval <local>/z: <implicit> = object : R|kotlin/Any| {
-        private constructor(): R|<anonymous><X>| {
+        private constructor(): R|test/classes/<anonymous><X>| {
             super<R|kotlin/Any|>()
         }