Fix clickhouse proxy issue, add support for database as query string DSN

[kokizzu]

Summary

some clickhouse proxy use database=bla as dsn not the path

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

[Copilot]

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

[jkaflik]

@kokizzu this change looks good. Thank you.

[kokizzu]

eh but makefile/CI breaks '__')
go mod tidy failed, i didn't change anything about go.mod

[jkaflik]

No worries - this is on our side with a broken main build. @SpencerTorres will address this.

[kokizzu]

yay green

[SpencerTorres]

Thanks! It looks like the query param's database takes priority over the path, which is reasonable logic