fix: download with resume

[numb3r3]

resume downloading of the model. Now if the downloading is interrupted (not completed) at the first time, the service cannot be started anymore.

[codecov]

Codecov Report

Merging #689 (700df50) into main (2558d73) will increase coverage by 0.17%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##             main     #689      +/-   ##
==========================================
+ Coverage   78.68%   78.86%   +0.17%     
==========================================
  Files          11       11              
  Lines         793      809      +16     
==========================================
+ Hits          624      638      +14     
- Misses        169      171       +2     

Flag	Coverage Δ
cas	78.86% <93.33%> (+0.17%)	⬆️

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Impacted Files	Coverage Δ
server/clip_server/model/clip.py	86.33% <92.30%> (+0.15%)	⬆️
client/clip_client/__init__.py	100.00% <100.00%> (ø)
server/clip_server/__init__.py	100.00% <100.00%> (ø)
server/clip_server/model/clip_onnx.py	81.81% <100.00%> (ø)

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