CrudManager has two configs for specifying extra stores to manage

[ExtAnimal]

crudStores and stores

The base class does

    construct(config = {}) {
        if (config.stores) {
            config.crudStores = config.stores;
            delete config.stores;
        }

I suggest we deprecate crudStores for removal in 7.0 on the basis that the "crud" part is redundant because we are inside the CrudManager, and go with the simple stores config/property.