support custom socket factory

[zhicwu]

Summary

Support custom socket factory as requested in #1391.

Checklist

Delete items not relevant to your PR:

• Unit and integration tests covering the common scenarios were added
• A human-readable description of the changes was provided to include in CHANGELOG
• For significant changes, documentation in https://github.com/ClickHouse/clickhouse-docs was updated with further explanations or tutorials

[mzitnik]

@zhicwu can you provide a complete code sample so we could add it to documentation

[zhicwu]

@zhicwu can you provide a complete code sample so we could add it to documentation

There's test(example) as well as default implementation. Do we still need complete code sample? I didn't see that happening in the server repo :)

Anyway, this was requested by @mayankvadariya, so let's wait for his comments before merging the PR.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
12 Code Smells

80.4% Coverage
1.0% Duplication

[zhicwu]

@mzitnik, can we merge this PR to close the issue?

[mayankvadariya]

Thank you @zhicwu for this effort. It slipped as I had been busy lately.

[zhicwu]

Thank you @zhicwu for this effort. It slipped as I had been busy lately.

No problem. Let us know if it fits your need.

[mayankvadariya]

Yes, I tested the changes locally. 🙌 Please let me know when can we release these changes.