Add Granite to model builder

[kunal-vaishnavi]

Description

This PR adds IBM's Granite models to the model builder. It also adds the following improvements to the model builder:

1. Always unpack any packed weights in the attention and MLP layers
2. Insert optional Add nodes if the MLP layer has a bias (the Granite code models use the LLaMA architecture but with biases included)
3. Use gate_up_proj or dense_h_to_4h as the attribute name when unpacking weights in the MLP layer

Motivation and Context

Granite is a family of foundation models from IBM.