support multi-threaded runtime in worker

[zh-jq-b]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 80.64516% with 24 lines in your changes missing coverage. Please review.

Project coverage is 54.31%. Comparing base (fa80c89) to head (4552b25).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/g3-runtime/src/unaided/mod.rs	80.45%	17 Missing ⚠️
g3bench/src/main.rs	40.00%	3 Missing ⚠️
g3bench/src/opts.rs	75.00%	2 Missing ⚠️
g3bench/src/worker.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #543      +/-   ##
==========================================
- Coverage   54.48%   54.31%   -0.17%     
==========================================
  Files        1180     1180              
  Lines      108694   108761      +67     
==========================================
- Hits        59222    59074     -148     
- Misses      49472    49687     +215     

Flag	Coverage Δ
g3bench	31.58% <15.00%> (-0.02%)	⬇️
g3proxy	53.84% <84.40%> (-0.19%)	⬇️
lib	25.00% <0.00%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.