Haystack 2.1.1

⚡️ Enhancement Notes

• Make SparseEmbedding a dataclass, this makes it easier to use the class with Pydantic

🐛 Bug Fixes

• Fix the broken serialization of HuggingFaceAPITextEmbedder, HuggingFaceAPIDocumentEmbedder, HuggingFaceAPIGenerator, and HuggingFaceAPIChatGenerator.
• Add to_dict method to DocumentRecallEvaluator to allow proper serialization of the component.