[Misc]: Torchair model runner refactor workflow

[wangxiyuan]

There is lot of torchair code in model runner leading the code hard for maintenance. We'll create new torchair_model_runner to split torchair related logic. There are 5 function contain torchair code. I'll refactor the code in the following step

1. create torchair_model_runner [1/N][Refactor] torchair model runner refactor #2205
2. move torchair code to common function, so that it can be override by torchair_model_runner
   • _get_forward_metadata_across_dp [2/N][Refactor] torchair model runner refactor #2204
   • dummy_run [3/N][Refactor] torchair model runner refactor  #2207
   • _process_reqs [6/N][Refactor] torchair model runner refactor #2220
   • initialize_kv_cache [4/N][Refactor] torchair model runner refactor #2208
   • capture_model [5/N][Refactor] torchair model runner refactor #2216
   • init [7/N][Refactor] torchair model runner refactor #2221
   • other common function
     • [8/N][Refactor] torchair model runner refactor  #2222