Add support for composite types to Appender

[Giorgi]

Add support for writing composite types (List, Array, Struct, etc) with Appender.

[Giorgi]

Lists and Arrays are now implemented.

[YogiCoder8888]

I'm using using a RowAppender to bulk insert a 1.5M rows with 2 fields, and Integer and List<double?>.

I get an exception:

An unhandled exception of type 'System.AccessViolationException' occurred in Unknown Module.
Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

It seems to work fine when I reduce the number of rows to 5000.

[Giorgi]

@YogiCoder8888 Can you open a new issue with more details? Include your code and version of DuckDB.NET

[Giorgi]

@YogiCoder8888 b13117d fixes the crash in appender.