Fix for appending lists with null · Giorgi/DuckDB.NET@53734da

Make this field 'private' and encapsulate it in a 'public' property. (https://rules.sonarsource.com/csharp/RSPEC-1104)

Rename struct '_value_e__Union' to match pascal case naming rules, trim underscores from the name. (https://rules.sonarsource.com/csharp/RSPEC-101)

Make this field 'private' and encapsulate it in a 'public' property. (https://rules.sonarsource.com/csharp/RSPEC-1104)

Make this field 'private' and encapsulate it in a 'public' property. (https://rules.sonarsource.com/csharp/RSPEC-1104)

Make this field 'private' and encapsulate it in a 'public' property. (https://rules.sonarsource.com/csharp/RSPEC-1104)

Make this field 'private' and encapsulate it in a 'public' property. (https://rules.sonarsource.com/csharp/RSPEC-1104)

Make this field 'private' and encapsulate it in a 'public' property. (https://rules.sonarsource.com/csharp/RSPEC-1104)

Rename struct 'DuckDBUHugeInt' to match pascal case naming rules, consider using 'DuckDbuHugeInt'. (https://rules.sonarsource.com/csharp/RSPEC-101)

Remove the unused private field 'internal_data'. (https://rules.sonarsource.com/csharp/RSPEC-1144)

Do not forget to remove this deprecated code someday. (https://rules.sonarsource.com/csharp/RSPEC-1133)

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