Add support for encoding TIFF images with the floating-point predictor,
which improves compression ratios for floating-point image data.
The floating-point predictor works by:
1. Converting floats to big-endian bytes
2. Shuffling bytes so all first bytes are together, all second bytes, etc.
3. Applying byte-level horizontal differencing across the buffer
This complements the existing decoding support for Predictor 3.
Supported types: Gray32Float, Gray64Float, RGB32Float, RGB64Float,
RGBA32Float, RGBA64Float, CMYK32Float, CMYK64Float.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
