@Override
    public AppAuthDO findByAppKey(final String appKey) {
        return appAuthMapper.findByAppKey(appKey);
    }
find page of application authority by query.

@param appAuthQuery {@linkplain AppAuthQuery}
@return {@linkplain CommonPager}
shenyu-admin/src/main/java/org/apache/shenyu/admin/service/impl/AppAuthServiceImpl.java