Support entities that have non-config entity bundles

This adds support for all bundles defined for a content entity type.

This code was moved into a new project.

Needs a reroll. Here's what I added to my swapped class

  /**
   * {@inheritdoc}
   *
   * @todo remove after https://www.drupal.org/project/openapi_jsonapi/issues/3091299
   */
  public function getDefinitions() {
    static $definitions = [];
    if (!$definitions) {
      foreach ($this->entityTypeManager->getDefinitions() as $entity_type) {
        if (!$entity_type instanceof ContentEntityTypeInterface) {
          continue;
        }
        $bundles = $this->entityTypeBundleInfo->getBundleInfo($entity_type->id());
        foreach ($bundles as $bundle_name => $bundle) {
          if ($this->includeEntityTypeBundle($entity_type->id(), $bundle_name)) {
            $definition_key = $this->getEntityDefinitionKey($entity_type->id(), $bundle_name);
            $json_schema = $this->getJsonSchema('api_json', $entity_type->id(), $bundle_name);
            $json_schema = $this->fixReferences($json_schema, '#/definitions/' . $definition_key);
            $definitions[$definition_key] = $json_schema;
          }
        }
      }
    }
    return $definitions;
  }