Giorgi / DuckDB.NET / 22734550158 / 3

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Add NULL handling support for scalar functions

Replace `isPureFunction` bool with `ScalarFunctionOptions`
record that supports `IsPureFunction` and `HandlesNulls`.

- Add `ScalarFunctionOptions` with `IsPureFunction` and
  `HandlesNulls` properties
- Bind `duckdb_scalar_function_set_special_handling` native
  method to enable NULL passthrough
- Update simplified scalar function extensions to validate
  nullable parameter types when `HandlesNulls` is true
- Propagate NULL correctly: nullable types get default,
  non-nullable types throw with a clear error message
- Update existing tests to use new options API

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