Add Apache HttpClient integration

[sczyh30]

Issue Description

Type: feature request

Describe what happened (or what feature you want)

Add integration module for Apache HttpClient (including async client). Contributions are welcomed!

[zhaoyuguang]

I will finish it ⛽️

[sczyh30]

I will finish it ⛽️

👍

[zhaoyuguang]

大佬们 我遇到了问题 望帮忙指点
Apache HttpClient拦截器有两个拦截器，
HttpRequestInterceptor and HttpResponseInterceptor
在发送前和相应后进行拦截，但是如果远端异常并不会进入响应拦截器
所以如果插件的使用变成了这样

        HttpContext context = new BasicHttpContext();
        CloseableHttpResponse response;
        try {
            response = httpclient.execute(httpGet, context);
        } catch (Exception e){
            SentinelApacheHttpClientHandleException.handle(context, e);
//这里需要用户必须try-catch 去回收发送拦截器中的exit-entry
            throw e;
        }
        try {
            HttpEntity entity = response.getEntity();
            result = EntityUtils.toString(entity, "utf-8");
            EntityUtils.consume(entity);
        } finally {
            response.close();
        }
        httpclient.close();
        return result;

这里需要用户必须try-catch 去回收发送拦截器中的exit-entry
还有什么更好的设计么？

[wavesZh]

@zhaoyuguang 也许可以利用 org.apache.http.impl.client.HttpClientBuilder#decorateMainExec 这个实现

[zhaoyuguang]

@zhaoyuguang 也许可以利用 org.apache.http.impl.client.HttpClientBuilder#decorateMainExec 这个实现

3KS

[zhaoyuguang]

@zhaoyuguang 也许可以利用 org.apache.http.impl.client.HttpClientBuilder#decorateMainExec 这个实现

看了下 execChain 貌似没有给用户自定义增加节点的地方，对么？
看起来需要用反射修改下 httpclient的execChain增加节点？

[jasonjoo2010]

这个是哪些异常拦截不到？name resolving timeout? connect timeout这类？

[jasonjoo2010]

decorateMainExec

这个其实waves同学讲的是，使用自定义的Builder类，比如：

private static class CustomBuilder extends HttpClientBuilder {
        protected org.apache.http.impl.execchain.ClientExecChain decorateMainExec(final org.apache.http.impl.execchain.ClientExecChain mainExec) {
            return new ClientExecChain() {
                
                @Override
                public CloseableHttpResponse execute(HttpRoute route, HttpRequestWrapper request, HttpClientContext clientContext,
                        HttpExecutionAware execAware) throws IOException, HttpException {
                    try {
                        return mainExec.execute(route, request, clientContext, execAware);
                    } catch (Exception e) {
                        System.out.println("exception");
                    }
                    return null;
                }
            };
        }
    }

相当于对外，就不需要暴露更多的东西，只需要要求用户使用SentinelHttpClientBuilder即可