@Override
    public List<SelectorData> findByPluginIdAndNamespaceId(final String pluginId, final String namespaceId) {
        return this.buildSelectorDataList(selectorMapper.findByPluginIdAndNamespaceId(pluginId, namespaceId));
    }
find page of selector by query.

@param selectorQuery {@linkplain SelectorQuery}
@return {@linkplain CommonPager}
shenyu-admin/src/main/java/org/apache/shenyu/admin/service/impl/SelectorServiceImpl.java