Unitxt 1.7.8

What's Changed

• Set empty list if preprocess_steps is None by @marukaz in #780
• fix a small typo by @dafnapension in #779
• Fix typo by @marukaz in #777
• Group shuffle by @sam-data-guy-iam in #639
• add perplexity with Mistral model by @lilacheden in #713
• Fix UI load failure due to typo by @yoavkatz in #785
• Type checking for task definition by @pawelknes in #710
• Add open and ibm_genai to llm as judge inference engine by @OfirArviv in #782
• Avoid creating a demo pool if num_demos is 0. by @yoavkatz in #787
• Update test_helm.yml by @elronbandel in #789
• Update instructions to install HELM from PyPI by @yifanmai in #783
• Update few-shot instructions in Unitxt with HELM by @yifanmai in #774
• Update version to 1.7.8 by @elronbandel in #790

Full Changelog: 1.7.7...1.7.8