Imagecodecs

- Fix testing on pypy and Python 3.10.

- Require libjxl 0.6.x.
- Add CMS codec via Little CMS library for color space transformations (WIP).
- Add MOZJPEG codec via mozjpeg library (Windows only).
- Add SPNG codec via libspng library.
- Rename avif_encode maxthreads parameter to numthreads (breaking).
- Accept n-dimensional output in non-image numcodecs decoders.
- Support masks in LERC codec.
- Support multi-threading and planar format in JPEG2K codec.
- Support multi-resolution, MCT, bitspersample, and 32-bit in jpeg2k encoder.
- Change jpeg2k_encode level parameter to fixed quality psnr (breaking).
- Change jpegxl_encode effort parameter default to minimum 3.
- Change JPEG encoders to use YCbCr for RGB images by default.
- Replace lerc_encode planarconfig with planar parameter (breaking).
- Add option to specify omp numthreads and chunksize in ZFP codec.
- Set default numthreads to 0.
- Fix Blosc default typesize.
- Fix segfault in jpegxl_encode.
- Replace many constants with enums (breaking).

- Add BLOSC2 codec via c-blosc2 library.
- Require LERC 3 and libjxl 0.5.
- Do not exceed literal-only size in PackBits encoder.
- Raise ImcdError if output is insufficient in PackBits codecs (breaking).
- Raise ImcdError if input is corrupt in PackBits decoder (breaking).
- Fix delta codec for non-native byteorder.

- Support more dtypes and axes argument in PackBits encoder.
- Fix worst case output size in PackBits encoder.
- Fix decoding AVIF created with older libavif.
- Fix decoding GIF with disposal to previous for first frame.
- Add lossless option in jpeg_encode.

- Fix building with Cython 0.3a7.
- Decode TIFF with JPEG compression, YCBCR or CMYK colorspace as RGB24.
- Vendor cfitsio/ricecomp.c for shared library builds on Windows (18).

- Add ZLIBNG codec via zlib-ng library.
- Add RCOMP (Rice) codec via cfitsio library.
- Fix decoding of 16-bit JPEG with jpeg_decode.
- Relax user provided output array shape requirement.