[torchtitan][debug] integrated CommDebugMode into TorchTitan

[sinhaanshul]

Stack from ghstack (oldest at bottom):

• -> [torchtitan][debug] integrated CommDebugMode into TorchTitan #480

Summary
I have enabled TorchTitan developers to have the option to use CommDebugMode to help debug when using DTensors. Users can use it by setting the command line argument to use CommDebugMode and have the option to use arguments to set the console file dump name, json file name, and noise level they want to use. Currently, the debugger fails when using compiled_rmsnorm. The temporary fix is to increase torch._dynamo.config.cache_size_limit before using commdebugmode.

Test Plan
CONFIG_FILE=./train_configs/debug_model.toml NGPU=4 LOG_RANK=0,1,2,3 ./run_llama_train.sh --comm_debug.enable_comm_debug_mode --model.norm_type="rmsnorm"

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