feat: support custom onnx file and update model signatures

[ZiniuYu]

This PR allows the user to set filepath for pretrained custom onnx model and unify the signature of tensorrt, onnx, and huggingface clip runtime. We also add md5 verification to make sure users download the latest and correct models. Since tensorrt models are extremely picky for many dependencies, we no longer support tensorrt model hosting, which means that it will first download the latest onnx model and convert to trt during runtime and save for it later use.

TODO:

• [x] Add parameters to allow user select custom pretrained onnx model
• [x] Convert existing models to have updated signatures
• [x] Modify other executors to be compatible with the new structure
• [x] Add MD5 verification for downloaded model

[codecov[bot]]

Codecov Report

Merging #761 (94008ac) into main (ed1b92d) will increase coverage by 0.71%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #761      +/-   ##
==========================================
+ Coverage   78.31%   79.03%   +0.71%     
==========================================
  Files          17       17              
  Lines        1213     1240      +27     
==========================================
+ Hits          950      980      +30     
+ Misses        263      260       -3     

Flag	Coverage Δ
cas	79.03% <100.00%> (+0.71%)	:arrow_up:

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Impacted Files	Coverage Δ
server/clip_server/executors/clip_torch.py	87.03% <ø> (ø)
server/clip_server/executors/clip_onnx.py	85.48% <100.00%> (ø)
server/clip_server/executors/helper.py	100.00% <100.00%> (ø)
server/clip_server/model/clip.py	65.60% <100.00%> (+6.31%)	:arrow_up:
server/clip_server/model/clip_onnx.py	96.96% <100.00%> (+0.96%)	:arrow_up:
server/clip_server/model/clip_trt.py	92.10% <100.00%> (-0.21%)	:arrow_down:

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[github-actions[bot]]

:memo: Docs are deployed on https://ft-improve_onnx--jina-docs.netlify.app :tada: