Add is_model_supported for fx
Author: inisis
Pull request: yes

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symbolic_trace within transformers is only applicable to PreTrainedModel, by calling check_if_model_is_supported we can check if model to be traced is supported, however this function will raise if not supported, I think we can return True/Fasle, so others can can call it outside transformers.


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Comments:
> Hi @inisis, thanks for opening this PR!
> 
> A word of caution - functions like these (not importable from the top-level of transformers, not part of the public documentation) are subject to change and not guaranteed to never be renamed, have modified behaviour or deleted. In fact - this PR does just that!
> 
> I don't think we should make this change. Semantically the function is performing a check. The equivalent, modified function would be `is_model_supported`, and users can implement that themselves easily.
> 
> Moreover, we don't know who might already be using this function, and relying on an exception being raised.
> 
> I do however agree it's better to have a single function return the bool and then the user can decide what to do with the output (raise etc.). If you want, we can add `is_model_supported` and have `check_if_model_is_supported` use that.

Hi @amyeroberts, thanks for your comment, I do agree that adding `is_model_supported` is far better than changing existing one, and I do feel this pr is needed, because I'm writing an intergrated tracer, it will choose different tracer based on the input model, this pr would be very helpful and elegant.