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chore: add CastKernel implementations for remaining array encodings (#4131)

Implements CastKernel for 7 array encodings that were missing cast
support:
- ALPRDArray: Floating-point encoding, supports nullability changes
- ByteBoolArray: Boolean encoding, delegates to BoolArray for type casts
- DecimalBytePartsArray: Decimal encoding, only supports
decimal-to-decimal casts
- DeltaArray: Delta encoding for unsigned integers only (avoids
overflow)
- PcoArray: Pcodec compression, handles nullability without
decompression
- SequenceArray: Arithmetic sequences, limited to integer types
- ZstdArray: Zstandard compression, handles nullability without
decompression

Each implementation includes:
- Optimized nullability-only changes without decoding
- Proper delegation to canonical form for unsupported casts
- Comprehensive test coverage with rstest parameterization
- Clear documentation of encoding-specific restrictions

🤖 Generated with [Claude Code](https://claude.ai/code)

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Signed-off-by: Will Manning <will@willmanning.io>
Co-authored-by: Claude <noreply@anthropic.com>

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