[Perf](bench): save perfermance info in beautiful format #80
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Motivation
this PR aims to automatically print all performance information and save it into excel file in clean format.
Technical Details
step 1: please pip install pandas openpyxl
step 2: git clone https://github.com/kimbochen/bench_serving.git in current path
step 3: change the variables in scripts
step 4: bash benchmark.sh
Test Result
the screen will print as below:


and the excel file format as: