feat: allow credential in client

[ZiniuYu]

This pr allow users to pass credential for HTTP and GRPC, and use it for authentication when getting request from server

[codecov]

Codecov Report

Merging #765 (50e6901) into main (2b78b12) will decrease coverage by 0.24%.
The diff coverage is 65.21%.

@@            Coverage Diff             @@
##             main     #765      +/-   ##
==========================================
- Coverage   82.09%   81.85%   -0.25%     
==========================================
  Files          17       17              
  Lines        1240     1251      +11     
==========================================
+ Hits         1018     1024       +6     
- Misses        222      227       +5     

Flag	Coverage Δ
cas	81.85% <65.21%> (-0.25%)	⬇️

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

Impacted Files	Coverage Δ
client/clip_client/client.py	86.38% <65.21%> (-1.95%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ca03dca...50e6901. Read the comment docs.

[numb3r3]

This PR looks fine so far. But I will block this PR until we have a solid integration test ready.