clickhouse_cfg_info: add the new module

[Andersson007]

SUMMARY

clickhouse_cfg_info: add the new module

this is MVP

If it's OK, let's merge this one and then discuss future possibilities in a new issue

[Andersson007]

@aleksvagachev ready for review

[Andersson007]

ready for review

[aleksvagachev]

@Andersson007 Thanks for developing the new module!

1. Are you planning to add xml in the future?
2. Do we need to add a file existence check?
3. This module must be executed on a clickhouse server. This is not necessary for other modules. They are executed on one host, and the connection and execution of sql is on the other. Should we stick to such a system or not?

[Andersson007]

@Andersson007 Thanks for developing the new module!

1. Are you planning to add xml in the future?
2. Do we need to add a file existence check?
3. This module must be executed on a clickhouse server. This is not necessary for other modules. They are executed on one host, and the connection and execution of sql is on the other. Should we stick to such a system or not?

@aleksvagachev thanks for asking:

1. Yes, but would be happy to delegate it if you or anybody else who wants to become a co-author. I've already googled and it should be easy to implement with a couple of libs
2. Maybe, but not in this PR. A bit of more graceful error handling, would probably make sense
3. I believe no, it's OK

[Andersson007]

@aleksvagachev thanks for reviewing!
would you like to add xml support and the file error handling feature yourself? I could do it if not, no problem. Please let me know

[aleksvagachev]

@Andersson007 If you have free time, please implement it. If not, I can do it.