Add __init__.py files to vibevoice/modular and vibevoice/processor
directories to properly export classes and enable package imports.
This allows users to import the package after installation:
- from vibevoice import VibeVoiceStreamingForConditionalGenerationInference
- from vibevoice.modular import VibeVoiceStreamingConfig
- from vibevoice.processor import VibeVoiceStreamingProcessor
Fixes import errors when using `pip install -e .`
YingboHAO