Enable megatron core loggers for GPT pretraining
jenkins jenkins @ericharper @ashbhandare what do you think about if we move the mcore logger params to the exp manager section in config? > @ericharper @ashbhandare what do you think about if we move the mcore logger params to the exp manager section in config?

It's kind of difficult to do now since we have models that don't use mcore outside of LLM and multimodal domains
 jenkins jenkins jenkins
# What does this PR do ?

Enables use of megatron timers in NeMo GPT pretraining and megatron_base based models.

Collection: collections/nlp/models/language_modeling

Usage
 model.enable_megatron_timers=True
 model.megatron_timer_kwargs.log_every_n_steps= 10
 model.megatron_timer_kwargs.log_mode=minmax
 model.megatron_timer_kwargs.barrier= False 
torchrun --nnodes=1 --nproc-per-node=8 \
    /gsw/code/NeMo/examples/nlp/language_modeling/megatron_gpt_pretraining.py  \
    --config-path=/gsw/code/NeMo/examples/nlp/language_modeling/conf \
    --config-name=megatron_gpt_config \
    trainer.devices=8 \
    trainer.num_nodes=1 \
    model.enable_megatron_timers=True \
    ++model.megatron_timer_kwargs.log_option=max \

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