Issue #2112705 by mikey_p: Replace EntityType::$module with provider.

core/includes/config.inc

core/lib/Drupal/Core/Entity/Annotation/EntityType.php

.../modules/aggregator/lib/Drupal/aggregator/Entity/Feed.php

.../modules/aggregator/lib/Drupal/aggregator/Entity/Item.php

...stom_block/lib/Drupal/custom_block/Entity/CustomBlock.php

..._block/lib/Drupal/custom_block/Entity/CustomBlockType.php

core/modules/block/lib/Drupal/block/Entity/Block.php

...es/breakpoint/lib/Drupal/breakpoint/Entity/Breakpoint.php

...eakpoint/lib/Drupal/breakpoint/Entity/BreakpointGroup.php

core/modules/comment/lib/Drupal/comment/Entity/Comment.php

...ig_test/lib/Drupal/config_test/Entity/ConfigQueryTest.php

.../config_test/lib/Drupal/config_test/Entity/ConfigTest.php

core/modules/contact/lib/Drupal/contact/Entity/Category.php

core/modules/contact/lib/Drupal/contact/Entity/Message.php

core/modules/editor/lib/Drupal/editor/Entity/Editor.php

core/modules/entity/entity.module

...modules/entity/lib/Drupal/entity/Entity/EntityDisplay.php

...les/entity/lib/Drupal/entity/Entity/EntityFormDisplay.php

...odules/entity/lib/Drupal/entity/Entity/EntityFormMode.php

...odules/entity/lib/Drupal/entity/Entity/EntityViewMode.php