Should a FIXED type for fixed-length character strings be added to DuckDB?

[Apache Iceberg](https://iceberg.apache.org/docs/latest/schemas/) supports the `fixed(L)` type for a fixed-length character string of length `L`. Should a similar type be added to [DuckDB]()? Without it, values of this type are cast to the `VARCHAR` type, which encoding might lead to performance degradation and | or memory waste. **Link**: [Types](https://github.com/sutoiku/puffin/blob/main/TYPES.md)