Feature: Add ClickHouse REST handler

[BohuTANG]

Summary

Endpoint:

/v1/clickhouse

Query

Uri:

/v1/clickhouse/?query=<sql>

Example:

echo 'SELECT 1' | curl 'http://localhost:8123/?query=' --data-binary @-
1

Insert

Uri:

/v1/clickhouse/?query=<insert into {db}.{table} format {foramt}> 

format:
1. Values
2. JSONEachRow

Example(values format):

echo '(7),(8),(9)' | curl 'http://localhost:8000/v1/clickhouse/?query=INSERT%20INTO%20t%20FORMAT%20Values' --data-binary @-

Example(JSONEachRow format):

echo '{"foo":"bar"}' | curl 'http://localhost:8000/v1/clickhouse/?query=INSERT%20INTO%20test%20FORMAT%20JSONEachRow' --data-binary @-