koord-manager: support setup transformers

[eahydra]

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

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[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (ad0e1e4) 66.02% compared to head (1b4bffb) 66.02%.
Report is 65 commits behind head on main.

Files	Patch %	Lines
pkg/util/transformer/transformers.go	0.00%	12 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1691   +/-   ##
=======================================
  Coverage   66.02%   66.02%           
=======================================
  Files         385      385           
  Lines       41589    41595    +6     
=======================================
+ Hits        27459    27464    +5     
- Misses      12112    12113    +1     
  Partials     2018     2018           

Flag	Coverage Δ
unittests	66.02% <0.00%> (+<0.01%)	⬆️

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[saintube]

Before we use the transformer to mutate the node cpu/mem allocatable in the informer cache, we need to implement the raw-allocatable API to let the node resource plugins know the real allocatable.

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