@Override
    public PluginVO findById(final String id) {
        return PluginVO.buildPluginVO(pluginMapper.selectById(id));
    }
find plugin by id.

@param id primary key.
@return {@linkplain PluginVO}
shenyu-admin/src/main/java/org/apache/shenyu/admin/service/impl/PluginServiceImpl.java