Client fault tolerant connection

[DeKinci]

Changelog category (leave one):

• New Feature

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
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Parameter host can accept multiple hosts. In case of unavailability of one of them, the client will try to connect to the next one.

Detailed description / Documentation draft:
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When multiple addresses are passed to the host argument and the first one is unavailable, the console client will try to connect to the next one.

By adding documentation, you'll allow users to try your new feature immediately, not when someone else will have time to document it later. Documentation is necessary for all features that affect user experience in any way. You can add brief documentation draft above, or add documentation right into your patch as Markdown files in docs folder.

If you are doing this for the first time, it's recommended to read the lightweight Contributing to ClickHouse Documentation guide first.

Information about CI checks: https://clickhouse.tech/docs/en/development/continuous-integration/