* #4983 implemented split by token for tiktoken tokenizer
* #4983 added unit test for tiktoken splitting
* #4983 implemented and added a test for splitting documents with HuggingFace tokenizer
* #4983 added support for passing HF model names (instead of objects) and added an example to the HF token splitting test
* mocked HTTP model loading in unit tests, fixed pylint error
* fix lossy tokenizers splitting, use LazyImport, ignore UnicodeEncodeError for tiktoken
* reno
* rename reno file
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Co-authored-by: Stefano Fiorucci <44616784+anakin87@users.noreply.github.com>
Co-authored-by: ZanSara <sara.zanzottera@deepset.ai>
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