perf(server): use await gather in rank function

[hanxiao]

No description provided.

[codecov]

Codecov Report

Merging #716 (004493c) into main (cda93fd) will decrease coverage by 13.67%.
The diff coverage is 81.25%.

@@             Coverage Diff             @@
##             main     #716       +/-   ##
===========================================
- Coverage   80.64%   66.96%   -13.68%     
===========================================
  Files          16       16               
  Lines        1111     1102        -9     
===========================================
- Hits          896      738      -158     
- Misses        215      364      +149     

Flag	Coverage Δ
cas	66.96% <81.25%> (-13.68%)	⬇️

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Impacted Files	Coverage Δ
server/clip_server/executors/clip_tensorrt.py	0.00% <0.00%> (-100.00%)	⬇️
client/clip_client/__init__.py	100.00% <100.00%> (ø)
server/clip_server/__init__.py	100.00% <100.00%> (ø)
server/clip_server/executors/clip_onnx.py	83.33% <100.00%> (-0.60%)	⬇️
server/clip_server/executors/clip_torch.py	84.78% <100.00%> (-0.64%)	⬇️
server/clip_server/executors/helper.py	98.24% <100.00%> (+3.24%)	⬆️
server/clip_server/model/clip_trt.py	0.00% <0.00%> (-92.31%)	⬇️
server/clip_server/model/trt_utils.py	0.00% <0.00%> (-83.52%)	⬇️

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