[Model] Add support for GraniteMoeShared models

[tjohnson31415]

Adds support for the granitemoeshared model type which is based on granitemoe but with the addition of a shared experts layer. A preview model with this architecture can be found at ibm-research/moe-7b-1b-active-shared-experts.

transformers support for this GraniteMoeShared model was recently merged and requires transformers >= v4.49.0

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[jeejeelee]

QQ: why doesn't input_linear support LoRA?

[tjohnson31415]

Thanks for taking a look!

Honestly, I don't know what is required for a layer to support LoRA... I presume that there is no reason for a simple linear layer not to, but do please let me know if there are reasons I would need to investigate 😅

I added input_linear and output_linear to the supported_lora_modules.

[tjohnson31415]

I did a quick test and PP doesn't seem to work for the GraniteMoe model either.
I can look in to that as a follow-on.

[DarkLight1337]

Since it's a test model, we can merge this as long as you can use the model on your end.