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Add support for DuckDB underscore numeric literals (#891)

DuckDB allows underscores in numeric literals, e.g. `1_000_000`. This PR
adds support for this.

- Add `numberRegex` option to `TokenizerOptions` to allow custom number
patterns
- Update `Tokenizer` to use custom number regex when provided
- Configure DuckDB formatter to support underscore separators in numbers
- Add test for underscore numeric literals in DuckDB

Let me know if you'd rather see this done differently! Thanks for the
great library.

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