Sarvam MoE support

[mohit-sarvam]

What does this PR do ?

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[yaoyu-33]

@mohit-sarvam thanks for contribution. Please let us know if you need help.

[cuichenx]

Thanks for the contribution. Could you add unit and functional tests for this model? You can follow the examples here

• unit tests
• conversion functional test

[mohit-sarvam]

@uppalutkarsh

[mohit-sarvam]

We will add functional tests once the model is open sourced.

[yaoyu-33]

thanks @mohit-sarvam