add(clickhouse): credentials integration

[wojcik-dorota]

https://aiven.atlassian.net/browse/DOC-686

Migrated from aiven/devportal#2442

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[ArthurFlag]

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[aris-aiven]

Another thing that would be nice here is linking the "Copy data between services" article (https://6e0767dd.aiven-docs.pages.dev/docs/products/clickhouse/howto/copy-data-across-instances) to the managed credentials.
Mentioning that users don't need to paste their passwords in the SQL statement will be appreciated by the more security conscious.

I was thinking of a paragraph like:

If you have a managed credential integration (link to doc) enabled, you may instead use

SELECT * FROM remoteSecure(`service_my-remote-cluster`, db.remote_engine_table) LIMIT 3;

[wojcik-dorota]

Another thing that would be nice here is linking the "Copy data between services" article (https://6e0767dd.aiven-docs.pages.dev/docs/products/clickhouse/howto/copy-data-across-instances) to the managed credentials. Mentioning that users don't need to paste their passwords in the SQL statement will be appreciated by the more security conscious.

I was thinking of a paragraph like:

If you have a managed credential integration (link to doc) enabled, you may instead use

SELECT * FROM remoteSecure(`service_my-remote-cluster`, db.remote_engine_table) LIMIT 3;

Thanks @aris-aiven ! Your comments have been addressed :-)

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[aris-aiven]

Nice 👍