Add modelconfig models generated from truss config schema

[cretz]

What changed

Added new baseten.client.modelconfig package with files generated from Truss config JSON schema. Also had to do some pre/post processing to fix names and minor bugs.

Will also do for Go and JS (bit harder there).

[Copilot]

Pull request overview

Adds a new baseten.client.modelconfig package containing Pydantic models generated from the Truss config.schema.json, plus apigen plumbing to download/preprocess/postprocess the schema and generate the package.

Changes:

• Add apigen support for downloading Truss config schema and generating baseten.client.modelconfig models (preprocess_truss_config_schema, postprocess_models, generate_modelconfig).
• Check in the Truss config schema JSON and generated modelconfig models + init exports.
• Add tests validating parsing of representative Truss config.yaml examples; add pyyaml dev dependency.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
uv.lock	Adds pyyaml to dev deps; bumps ty lock to 0.0.33.
pyproject.toml	Adds pyyaml to dev dependency group; bumps ty constraint.
scripts/apigen/main.py	Downloads Truss config schema and generates client/modelconfig.
scripts/apigen/preprocess.py	Adds preprocessing to rename Truss* schema defs to Model*.
scripts/apigen/postprocess.py	Postprocesses generated models to fix datamodel-codegen typing issues.
scripts/apigen/specs/config.schema.json	Adds checked-in Truss config JSON schema used for generation.
baseten/client/modelconfig/_models.py	Adds generated Pydantic models for config schema.
baseten/client/modelconfig/init.py	Exports all generated model types.
tests/client/test_modelconfig.py	Adds tests validating parsing of sample config YAMLs.

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