feat: streaming_callback as run param from HF generators

[tstadel]

Related Issues

• streaming_callback run param should be supported in a unified way throughout haystack main package. So far only OpenAIGenerator and AzureOpenAIGenerator support the run param. HuggingFaceAPIGenerator and HuggingFaceLocalGenerator lack this kind of support.

Proposed Changes:

• add streaming_callback run param to HuggingFaceAPIGenerator and HuggingFaceLocalGenerator

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