fix(tvp): add missing type_vocab_size parameter to TvpConfig (#42928)
Fixes #42925
The `type_vocab_size` parameter was missing from TvpConfig, causing an
AttributeError when instantiating TvpModel. This adds the parameter
with a default value of 2, which matches all TVP models on Hugging Face
Hub.
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>