fix: Match rasterio/libtiff output values for jpeg ycbcr decoding

[kylebarron]

Change list

• Uncomment Python integration tests against rasterio with ycbcr jpeg compression
• Switch JPEG decoder to mozjpeg, which uses libjpeg-turbo under the hood
• Parse the reference_black_white tiff tag, used for ycbcr rgb decoding
• Handle parsing Rational values to f64

Closes #266

[kylebarron]

These tests passed locally but then failed on CI! So it seems there's a platform difference either for rasterio or for us!