Ensure Model is Correctly Loaded for Augmentation Purposes

[fabianlim]

There is a need to ensure that the model has been correctly loaded before augmenting the model.

• if there is no model_loader being called, we do not have visiblity into the flags passed into from_pretrained
• so we will not know how the model is loaded
• however, we need to have certain knowledge in some use cases.

Use Case 1: multipack needs to know if a linear or quadratic attention has been set.

• it is safe now because padding_free in FMS-hf-tuning checks that flash_attn is set
• however, in the future if multipack is independent of padding free plugin, then we need to do this extra check