chore: use slave sentinel for readonly vertices

[ab93]

• get slave client for preprocess, inference and threshold
• reduce floating point precision in the final output score to make it more readable in the argocd UI
• reduce floating point precision in the logs

[codecov-commenter]

Codecov Report

Merging #161 (ad5cbff) into main (620d1f3) will decrease coverage by 0.12%. The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main     #161      +/-   ##
==========================================
- Coverage   86.35%   86.23%   -0.12%     
==========================================
  Files          18       18              
  Lines        1114     1119       +5     
  Branches      117      118       +1     
==========================================
+ Hits          962      965       +3     
- Misses        129      130       +1     
- Partials       23       24       +1     

Impacted Files	Coverage Δ
numaprom/udf/preprocess.py	90.00% <ø> (ø)
numaprom/clients/sentinel.py	72.00% <50.00%> (-6.27%)	:arrow_down:
numaprom/entities.py	95.65% <100.00%> (+0.04%)	:arrow_up:
numaprom/udf/inference.py	92.85% <100.00%> (ø)
numaprom/udf/postprocess.py	96.62% <100.00%> (+0.07%)	:arrow_up:
numaprom/udf/threshold.py	92.18% <100.00%> (ø)

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