allow using ca_cert parameter

[viktor-ozherelev]

Summary

Relates to the issue. This PR the problem of connecting to a Managed ClickHouse cluster whose server certificate is signed by an internal root Certificate Authority. Added support for the CA root in httpclient and nativeclient using the ca_cert parameter

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

[CLAassistant]

All committers have signed the CLA.

[koletzilla]

Hi @viktor-ozherelev , sorry for taking so long to check your PR.

I like the PR and it's ready to merge, but there're conflicts that I can't solve. The PR has the Maintainers are allowed to edit this pull request. tag, but your PR comes from your fork's main branch and main is a protected branch, so I can't do changes there.

Would you rebase and fix this issues? Just needs to change the entry of the changelog to the last release and leave the readme empty as now that docs lives in https://clickhouse.com/docs/integrations/connectors/data-ingestion/etl-tools/dbt. I'll update the docs with that.

Or if you prefer, I can recreate the branch, create a new PR with your commit cherrypicked (I think that way it keeps you as author) and merge it myself. I'd do that without problems.