Issue #2430219 by alexpott: Implement a key value store to optimise config entity lookups

core/core.services.yml

core/lib/Drupal/Core/Config/Entity/ConfigEntityType.php

...b/Drupal/Core/Config/Entity/ConfigEntityTypeInterface.php

...al/Core/Config/Entity/Query/InvalidLookupKeyException.php

core/lib/Drupal/Core/Config/Entity/Query/Query.php

core/lib/Drupal/Core/Config/Entity/Query/QueryFactory.php

core/modules/block/src/Entity/Block.php

core/modules/config/tests/config_test/config_test.module

...modules/system/src/Tests/Entity/ConfigEntityQueryTest.php

core/modules/tour/src/Entity/Tour.php

...rupal/Tests/Core/Config/Entity/Query/QueryFactoryTest.php