Add timo interface for model serving

[atalyaalon]

Summary

• Add sinonym/timo/ package with interface.py (Instance, Prediction, Predictor), config.yaml, and integration test
• predict_batch() uses process_name_batch() for cross-name format detection by default (use_batch_context=True)
• Add pydantic as optional timo dependency in pyproject.toml
• Bump version to 0.2.6

Test plan

• pytest sinonym/timo/integration_test.py — 4 tests pass (batch with/without context)
• pytest tests/test_timo_interface.py — 12 tests pass (single, batch, edge cases, serialization)
• Run timo publish -f sinonym/timo/config.yaml to publish to internal PyPI + S3