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.

Begin at the tokenizer's handling of the MySQL and Hive numeric special cases, then inspect how curly-brace tokens are emitted before Dialect processing. Done means the parser accepts the shown ClickHouse parameterized-view form while preserving existing curly-brace behavior.

Written by the indexing model from the issue text.