Anna

Added support for ClickHouse

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[ClickHouse](https://clickhouse.com/) adapter implementation (resolves https://github.com/ankane/blazer/issues/378). Requires `click_house` Ruby driver to interact with clickhouse-server via HTTP interface. Adapter methods: - run_statement - tables - schema - preview_statement - explain Readme instructions...

Hi! It would be great to have adapter for [ClickHouse](https://clickhouse.com/) since its growing popularity among columnar databases. I use ClickHouse database in my Rails project along with PostgreSQL. I also...