feat(jpeg): Support reading Ultra HDR images

[mugulmd]

Description

Initial feature request: https://github.com/AcademySoftwareFoundation/OpenImageIO/issues/4424

Add support in the jpeg plugin for reading Ultra HDR images using the reference codec libultrahdr: https://github.com/google/libultrahdr

Tests

Images used for testing during development: https://github.com/MishaalRahmanGH/Ultra_HDR_Samples

Checklist:

• [x] I have read the contribution guidelines.
• [x] I have updated the documentation, if applicable. (Check if there is no need to update the documentation, for example if this is a bug fix that doesn't change the API.)
• [x] I have ensured that the change is tested somewhere in the testsuite (adding new test cases if necessary).
• [x] If I added or modified a C++ API call, I have also amended the corresponding Python bindings (and if altering ImageBufAlgo functions, also exposed the new functionality as oiiotool options).
• [x] My code follows the prevailing code style of this project. If I haven't already run clang-format before submitting, I definitely will look at the CI test that runs clang-format and fix anything that it highlights as being nonconforming.