Fix import errors

[Batmaev]

Problem

I tried to run the package using Python 3.12.

I got several errors:

  File "webeyetrack/webeyetrack.py", line 7, in <module>
    import tensorflow as tf
ModuleNotFoundError: No module named 'tensorflow'

  File "webeyetrack/data_protocols.py", line 110, in <module>
    @dataclass
     ^^^^^^^^^
ValueError: mutable default <class 'numpy.ndarray'> for field norm_pog is not allowed: use default_factory

----> WebEyeTrack(WebEyeTrackConfig())

RuntimeError: Unable to open file at .venv/lib/python3.12/site-packages/webeyetrack/model_weights/face_landmarker_v2_with_blendshapes.task

Solution

1. Add missing tensorflow dependency

2. In dataclasses, mutable default values, such as numpy arrays, are shared across all instances. Since Python 3.11, using them without default_factory or ClassVar results in ValueError. So I've added default_factory.

3. Include model weights in the package (they are small)