ClickHouse parameterized view

I'd like to parse ClickHouse SQL which contains parameters for their [parameterized views](https://clickhouse.com/docs/en/sql-reference/statements/create/view#parameterized-view). The SQL looks like

`CREATE VIEW view AS SELECT * FROM TABLE WHERE Column1={column1:datatype1}`

Note the parameter is in the { } brackets. I don't think this could be implemented in the `Dialect` as curly braces are tokenized without deferring to the dialect. It would probably have to be handled by the tokenizer as a special case like numbers are for MySQL & Hive.

从 tokenizer 处理 MySQL 和 Hive 的数值特殊情况开始，然后检查在 Dialect 处理之前花括号 token 是如何发出的。完成的标准是：parser 接受所示的 ClickHouse 参数化视图形式，同时保留现有的花括号行为。

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