Changelog for duckdb-simple-0.1.2.1

Changelog

Add support for reading and writing arrays.
Added Database.DuckDB.Simple.Generic with GHC generics helpers (GToField/GFromField) for encoding records as DuckDB STRUCTs and sum types as UNIONs, plus a ViaDuckDB newtype for convenient @DerivingVia@ support.
Added DuckValue instances for [], Array Int a, and Map k v to enable lists, arrays, and maps as fields within generically-encoded structs and unions.
Documented struct/union generic support; added richer tests covering database round-trips and deriving-via examples.
Support decoding and binding STRUCT and UNION values via new StructValue/UnionValue helpers and corresponding FromField/ToField instances.

Added LIST/MAP coverage note: LIST columns decode into Haskell lists and MAP columns into strict Map k v, with matching parameter bindings via ToField.
Taught FromField to interpret FieldBigNum as Integer/Natural and added matching ToField instances for BigNum, Integer, and Natural so BIGNUM parameters round-trip without truncation.
Added duckdbColumnType helper and DuckDBColumnType class, exposing the DuckDB column type associated with each ToField instance.
Fixed UUID decoding by undoing DuckDB’s upper-word bias and added a UUID round-trip regression test.
Fixed BIT encoding and decoding

Broadened FieldValue and FromField coverage to handle all DuckDB scalar types, including intervals, HUGEINT/UHUGEINT, decimals (with metadata), time/timestamp with additional precisions, timezone-aware values, bit strings, bignums, and enums.
Fixed enum decoding for both query results and scalar-function inputs by honouring the logical type’s underlying storage width (uint8/uint16/uint32).
Ensured decimal vectors read accurate width/scale metadata when materializing results or invoking UDFs.
Added unsigned ToField bindings that route through DuckDB’s native uint creators and exposed FromField Word.
Expanded the test suite with regressions covering unsigned round-trips, huge integers, intervals, decimals, and timezone-aware values.