WIP: init prediction manager framework

[zwzhang0107]

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.53%. Comparing base (cd58ac6) to head (9c119fc).
Report is 21 commits behind head on main.

❗ Current head 9c119fc differs from pull request most recent head 1b30e5a. Consider uploading reports for the commit 1b30e5a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1889      +/-   ##
==========================================
- Coverage   67.56%   67.53%   -0.03%     
==========================================
  Files         420      420              
  Lines       47059    47059              
==========================================
- Hits        31795    31782      -13     
- Misses      12955    12964       +9     
- Partials     2309     2313       +4     

Flag	Coverage Δ
unittests	67.53% <ø> (-0.03%)	⬇️

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[koordinator-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
To complete the pull request process, please ask for approval from zwzhang0107 and additionally assign eahydra, fillzpp after the PR has been reviewed.
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• pkg/client/OWNERS
• pkg/prediction/OWNERS
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