Theming field template

Module alters theme registry to override field-template, instead of implementing custom theme via theme hook. Module should implement its own theme hook.

Temporary workaround: Override theme registry alter hook with custom path:

/**
 * Implements hook_theme_registry_alter().
 */
function my_module_theme_registry_alter(&$theme_registry) {
  $theme_registry['field__flipbook__flipbook__flipbook']['path'] = \Drupal::theme()->getActiveTheme()->getPath() . '/templates';
}