support module.classname config specification for plugins

[jmartin-tech]

Original config support was intended to maintain this support in a deprecated format. Planned feature functionality suggests this should officially be maintained and is helpful to have aligned with how the cli accepts plugin values.

Verification

List the steps needed to make sure this thing works

• Supporting configuration such as generator configuration file hf_RigoChat_gpu.yaml

plugins:
  generators:
    huggingface.Model:
      name: IIC/RigoChat-7b-v2
      hf_args:
        device: cuda
        trust_remote_code: true
        torch_dtype: float16

• garak -m huggingface.Model -p test.Test --config hf_RigoChat_gpu.yaml
• Verify via log review that the model configuration applies on instantiation.

Specific Hardware:

• requires cuda capable GPU for the example config however mps could be substituted on arm based macOS.

[erickgalinkin]

Makes sense to me!