[feat-35406][docs] add http sink plugin doc

Author: simenliuxing

Diff for: docs/plugin/httpSink.md

@@ -0,0 +1,66 @@
+## 1.格式：
+```
+CREATE TABLE tableName(
+    colName colType,
+    ...
+    colNameX colType
+ )WITH(
+    type ='http', 
+    url ='http://xxx:8080/test/returnAll'
+    ,flag ='aa' 
+    ,delay = '10' 
+ );
+
+```
+
+
+## 3.表结构定义
+
+|参数名称|含义|
+|----|---|
+| tableName| http表名称|
+| colName | 列名称|
+| colType | 列类型 [colType支持的类型](../colType.md)|
+
+## 4.参数：
+
+|参数名称|含义|是否必填|默认值|
+|----|----|----|----|
+|http |结果表插件类型，必须为http|是||
+|url | 地址 |是||
+|flag | 结果返回标识符|否||
+|delay |每条结果数据之间延时时间 |否|默认20毫秒|
+
+
+## 5.样例：
+
+```
+
+-- {"name":"maqi","id":1001}
+CREATE TABLE sourceIn (
+    id int,
+    name VARCHAR
+)WITH(
+    type  =  'kafka',  
+    bootstrapServers  =  'localhost:9092',  
+    topic ='test1'
+ );
+
+CREATE  TABLE  sinkOut  (
+  id  int 
+  , name varchar 
+) WITH  (
+  type ='http', 
+  url ='http://xxx:8080/test/returnAll'
+  ,flag ='aa' 
+  ,delay = '10' 
+);
+
+insert into sinkOut select id,name from sourceIn;
+
+ ```
+
+发送数据：{"name":"maqi","id":1001}
+</br>结果数据：
+</br>1.flag不填或者为空串：{"name":"maqi","id":1001}
+</br>2.flag有内容：{"flag":"11111111","name":"maqi","id":1001,"tableName":"sinkOut"}

Diff for: docs/pluginsInfo.md

@@ -17,6 +17,7 @@
 * [impala 结果表插件](plugin/impalaSink.md)
 * [db2 结果表插件](plugin/db2Sink.md)
 * [sqlserver 结果表插件](plugin/sqlserverSink.md)
+* [http 结果表插件](plugin/httpSink.md)
 
 #### 1.3 维表插件
 * [hbase 维表插件](plugin/hbaseSide.md)