Support for session-id for multiple query statement

[pavelnemirovsky]

Does chproxy tolerate the session-id field when it's passed between the proxy and Java ClickHouse JDBC client?
I am referring to the following functionality ...

To use temporary tables you need to have an active session. It's enough to add session_id parameter with some value to the URL of ClickHouse request.

So for example:
replace http://127.0.0.1:8123/
to http://127.0.0.1:8123/?session_id=mysession

Later requests with the same session_id will 'remember' temporary tables, settings, etc. you did in previous queries with that session_id.

Please also remember that sessions use exclusive locks, so you can't run 2 requests with the same session_id concurrently. And by default session lifetime equals 60 seconds, but can be adjusted.

Check the official documentation https://clickhouse.yandex/docs/en/interfaces/http/```

[pavelnemirovsky]

@vmlam @hagen1778 @Gorokhov @valyala proposed solution under here #117 please review

[gontarzpawel]

Delivered in #117