Using the ConfigImporter during installation results in a double memory cache

Problem/Motivation

The \Drupal\Core\Installer\NormalInstallerServiceProvider swaps out database caches for memory caches and the Storage comparer wraps the active config in a memory cache. So when install from config the StorageComparer target storages have double memory caches which is wasteful.

Steps to reproduce

1. Install standard
2. rename standard_install to _standard_install
3. run drush config-export
4. run drush si --existing-config

Proposed resolution

MAYBE make \Drupal\Core\Config\CachedStorage::$cache public or have a getter... and then in StorageComparer check if a CachedStorage and if the cache is a memory cache.
OR add a boolean to \Drupal\Core\Config\StorageComparer::__construct() that determines if the target storage should be wrapped.

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet