add '--workers' args for tools/api_server.py,i cannot run it

[suchaunzhi]

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Environment Details

Python=3.10 Ubuntu

Steps to Reproduce

for python tools/api_server.py --listen="0.0.0.0:9003" --workers=3 I get the error,and it does not run. WARNING: You must pass the application as an import string to enable 'reload' or 'workers'.

✔️ Expected Behavior

No response

❌ Actual Behavior

No response