Implement getConfigs method for ConfigClient

[raphaelsoul]

No description provided.

[raphaelsoul]

实现了一下getConfigs方法 我自己用如下代码做workaround。
看情况close吧 dev分支差异蛮大的

ps: 没找到md说明如何接收社区PR

const ClientWoker = require("nacos-config/dist/client_worker").ClientWorker

ClientWoker.prototype.getConfigs = async function (appName) {
    this.debug('calling getConfigs, appName %s', appName);

    let content;
    const key = this.getSnapshotKey("", "") + "/" + appName;
    // TODO 优先使用本地配置
    appName = appName || this.options.configuration.innerConfig.appName
    try {
        content = await this.httpAgent.request(this.apiRoutePath.GET, {
            data: {
                dataId: "",
                group: "",
                appName,
                tenant: this.namespace,
                search: "accurate",
                pageNo: 1,
                pageSize: 200
            },
        });
    }
    catch (err) {
        const cache = await this.snapshot.get(key);
        if (cache) {
            this._error(err);
            content = parseJSONSafe(cache)
            return _.get(content, "pageItems", []) || [];
            return content;
        }
        throw err;
    }
    await this.snapshot.save(key, content);
    content = parseJSONSafe(content)
    return _.get(content, "pageItems", []) || [];
}

[raphaelsoul]

另外单元测试 master分支本身就是跑失败

  3) test/client_worker.test.ts
       test features in find address mode
         mock error
           should throw error if http status is 409:

      Uncaught AssertionError [ERR_ASSERTION]:   # client.test.ts:53
  
  assert(err.message === 'mock error')
         |   |       |                
         |   |       false            
         |   "[Nacos#ServerListManager] request url: http://acm.aliyun.com:8080/nacos/serverlist failed with statusCode: 409"
         Error{message:"[Nacos#ServerListManager] request url: http://acm.aliyun.com:8080/nacos/serverlist failed with statusCode: 409"}
  
  --- [string] 'mock error'
  +++ [string] err.message
  @@ -1,10 +1,110 @@
  -mock error
  +[Nacos#ServerListManager] request url: http://acm.aliyun.com:8080/nacos/serverlist failed with statusCode: 409
  
  
      + expected - actual

      -false
      +true
      
      at DataClient.client.on.err (test/client.test.ts:53:7)
      at Immediate.setImmediate (src/client.ts:244:37)
      [use `--full-trace` to display the full stack trace]

[czy88840616]

这个感觉是个breaking 了，可以单开一个 API，比如 getConfigsByAppName 啥的。

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