Issue #1913328 by fago: Provide general list and map classes.

core/lib/Drupal/Core/Entity/Field/Type/Field.php

core/lib/Drupal/Core/TypedData/ItemList.php

core/lib/Drupal/Core/TypedData/Type/Any.php

core/lib/Drupal/Core/TypedData/Type/Map.php

core/lib/Drupal/Core/TypedData/TypedDataManager.php

...ystem/lib/Drupal/system/Tests/TypedData/TypedDataTest.php

core/modules/system/system.api.php

core/modules/system/system.module