Unitxt 1.26.0 - Multi Threading

Main changes:

• Made Unitxt Thread-Safe so it can run in multi-threaded environments.
• Added an option to set sampling seed for demos (in context example). This is done by demos_sampling_seed. It allows running the same dataset with different demo examples.
• Improved printouts of instance scores with to_markdown() and summary in Unitxt. For example :

results = evaluate(predictions=predictions, data=dataset)
print(results.instance_scores.summary)

All changes:

• Add to_markdown() to InstanceScores to pretty print output by @yoavkatz in #1846
• Improved InstanceScores summary to be readible and in decent width by @yoavkatz in #1847
• Improve multi turn tool calling example by @elronbandel in #1848
• Add metrics documentation including range, directionality and references by @elronbandel in #1850
• Fix sacrebleu documentation by @elronbandel in #1851
• Add F1 score documentation to F1Fast metric class by @elronbandel in #1852
• Add more llmjudge benchmarks by @martinscooper in #1804
• Fix llama scout name and url on rits by @martinscooper in #1857
• Add demos_sampling_seed to recipe api by @elronbandel in #1858
• Add comprehensive multi threading support and tests by @elronbandel in #1853
• Update BlueBench to match the original implementation by @bnayahu in #1855

Full Changelog: 1.25.0...1.26.0