Added support for JXS file format

[V-R-Dighe]

No description provided.

[V-R-Dighe]

Hey @gabriel-vasile, I am requesting permission to run the workflows. Also, please look into my PR. Thanks!

[gabriel-vasile]

Hi, PR looks good, except for 2 problems.

1. there is already an older open PR for JXR
2. the PR does not have testfiles

If you are keen to get this merged ASAP, then make this PR only about JXS format and add a testfile for it. I recommend you convert the JPG testfile to JXS but any other image works as long as it is released under a permissive license and it's under 300kb in size.

[gabriel-vasile]

I did some digging about this format. JXS is still in early stages. They decided on the magic numbers and the MIME type of the format, but they didn't yet release an actual implementation of JXS encoder. They will do this sometime in 2022 in Part 5 of the release.

Part 5 (ISO/IEC 21122-5) represents a reference software implementation (written in ISO C11) of the JPEG XS Part 1 decoder, conforming to the Part 2 profiles, levels and sublevels, as well as an exemplary encoder implementation.
Check here: https://en.wikipedia.org/wiki/JPEG_XS#Standards

[gabriel-vasile]

I opened #322 as a reminder and I will proceed to merge this as it is.

[codecov-commenter]

Codecov Report

Merging #319 (6ffd7ad) into master (98f3091) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #319   +/-   ##
=======================================
  Coverage   94.96%   94.96%           
=======================================
  Files           3        3           
  Lines         159      159           
=======================================
  Hits          151      151           
  Misses          6        6           
  Partials        2        2           

Impacted Files	Coverage Δ
tree.go	50.00% <ø> (ø)

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[V-R-Dighe]

I opened #322 as a reminder and I will proceed to merge this as it is.

Thank you @gabriel-vasile.
Surely, I will add the test file once the JXS implementation is released.