switch to exllama_config instead of disable_exllamav2 (#1505)
* switch to a config_dict instead of disable_exllamav2
* Apply suggestions from code review
Co-authored-by: fxmarty <9808326+fxmarty@users.noreply.github.com>
* better tests
* style
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Co-authored-by: fxmarty <9808326+fxmarty@users.noreply.github.com>
