Add an option to override ModelSpec.model_key #2726
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Summary:
Most of our models now utilize MBM, which can represent many different models using the same Models.BOTORCH_MODULAR. Being able to overwrite the default model key "BoTorch" will allow us to be more expressive about what model was used to generate a given candidate.
Follow-up diff will utilize this to require unique model key for each ModelSpec in a GenerationNode, which will ensure identifiability when multiple MBM models are used with model selection.
Differential Revision: D61984169