Appender support for arrays (or alternative)

[cipriancraciun]

At the moment, although the Value and ValueRef seem to mention support for arrays, lists, and a few related items, none of them seem to be implemented (i.e. the code panics with unsupported!()) when used in Appender::append_row or even for parameter binding in prepared statements.

It would be nice, since DuckDB does support array / list types, to be able to bulk insert data (or at least insert row-by-row) that contains such types.

In the interim, is there perhaps a workaround? (Besides serializing the data as JSON and using COPY, or writing a prepared statement that deserializes data a string via JSON.)