Cosmos: allow value converters for collections of primitive types #25343
Description
See https://github.com/npgsql/efcore.pg/blob/main/src/EFCore.PG/Storage/ValueConversion/INpgsqlArrayConverter.cs for a way of implementing this.
Also try to use built-in converters automatically, see https://github.com/npgsql/efcore.pg/blob/main/src/EFCore.PG/Storage/ValueConversion/NpgsqlValueConverterSelector.cs