Minimax M2 Model Support

[fzyzcjy]

(I will probably work on it for the parts that is related to miles/slime, just create an issue for easy tracking and see whether you are happy to accept PRs)

Add support for MiniMax M2 model:

Please include a link to the model's HuggingFace repo
https://huggingface.co/MiniMaxAI/MiniMax-M2

These checklist items are required for all models in Megatron Bridge

• Model providers
• Model bridge for HF conversion
• Unit tests (config and bridge)
• Model conversion functional tests

For flagship models, these items are also needed

• Optimal pretraining recipe
• Optimal finetuning recipe
• Recipe unit tests
• Recipe functional tests
• End to end CI tests

Additional context
Add any other context or screenshots about the model request here.

[yaoyu-33]

@fzyzcjy We are more than happy to accept PRs! Feel free to ask any questions here.

Please refer to our contributing doc:
https://docs.nvidia.com/nemo/megatron-bridge/latest/adding-new-models.html

Please attach your testing results (megatron matching HF) if possible.

[fzyzcjy]

Sure! This support task is depriortized yesterday thus I may not have much time for it recently, but it is probable that I will do the ones for RL framework later

[yaoyu-33]

#2602