Issue #2175415 by swentel, tim.plunkett, jibran, larowlan: Add FieldTypePluginManagerInterface.

core/lib/Drupal/Core/Field/FieldDefinitionInterface.php

core/lib/Drupal/Core/Field/FieldTypePluginManager.php

...lib/Drupal/Core/Field/FieldTypePluginManagerInterface.php

core/lib/Drupal/Core/Field/FormatterPluginManager.php

...l/Core/Field/Plugin/DataType/Deriver/FieldItemDeriver.php

core/lib/Drupal/Core/Field/WidgetPluginManager.php

core/modules/field/lib/Drupal/field/FieldInfo.php

...ules/field_ui/lib/Drupal/field_ui/DisplayOverviewBase.php

...ules/field_ui/lib/Drupal/field_ui/FieldListController.php

core/modules/field_ui/lib/Drupal/field_ui/FieldOverview.php

core/tests/Drupal/Tests/Core/Entity/FieldDefinitionTest.php

...ts/Core/Entity/FieldableDatabaseStorageControllerTest.php