Tracking issue for implementing PRJECTIONS syntax for ClickHouse

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ClickHouse supports the Projections mechanism to store data in a format that optimizes query execution. It allows using ALTER TABLE to manipulate projections: https://clickhouse.com/docs/en/sql-reference/statements/alter/projection.

And I'm going to support those syntaxes for the ClickHouse parser, but to make PRs easier to review. I will separate them into three parts:

1. Add support of ADD PROJECTION syntax for ClickHouse #1390
2. Add support of DROP|CLEAR|MATERIALIZE PROJECTION syntax for ClickHouse #1417
3. Add support of PROJECTION column when creating table for ClickHouse

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3. Add support of PROJECTION column when creating table for ClickHouse

ClickHouse documentation doesn't record this feature for now, will support this after users requested this or the official documentation recorded this feature.