Summary:
Modify stool so that:
- It uses jinja2 for better templating
- Add args to allow force non-interactive overrides
- Add config_parser argument to allow instantiation of pydantic class when some defaults don't exist and use it in stool, to allow the rest of the configuration parser to work.
Test Plan:
```
uv run python -m bytelatent.stool config=/storage/home/par/code/internal-blt/configs/par/stool/run_blt_1b_aws.yaml
uv run python -m bytelatent.train config=../internal-blt/configs/par/train/aws/blt_1b_dclm_aws.yaml dump_dir=/checkpoint/comem/par/scratch/debug data.batch_size=2
```
Summary:
Make it possible to specify multiple config files.
Parsing CLI is not a special case anymore, just uses the same config inheritance method.
Test Plan:
Test that this iterpolates in the right order via unit tests
Sample usage, loads the internal config, which references bytelatent/configs/entropy_model.yaml. The precendence order is:
- Default pydantic args
- Included configs, eg `config`
- CLI args
```
python -m bytelatent.print_config config=internal/configs/entropy_model.yaml eval=null
```
Summary:
Test Plan:
