all: support priority and preemption policy transformer

[saintube]

Ⅰ. Describe what this PR does

Support features PriorityTransformer and PreemptionPolicyTransformer:

• PriorityTransformer: transform the priority value of the pod according to its priority class, allowing us to adapt the pods existing in the cluster that have not set priorities.
• PreemptionPolicyTransformer: transform the preemption policy of the pod according to a preemption label and the global default policy, allowing us to take over the pods existing in the cluster that may set the default preemptible policy. It helps when the cluster has many kinds of pods set the PreemptLowPriority by default priority classes but we want to enable the preemption only for specific pods.

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

Attention: Patch coverage is 62.26415% with 20 lines in your changes missing coverage. Please review.

Project coverage is 67.86%. Comparing base (4a182a1) to head (710d26e).

Files	Patch %	Lines
pkg/util/transformer/pod_transformer.go	73.80%	8 Missing and 3 partials ⚠️
pkg/util/transformer/transformers.go	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2137      +/-   ##
==========================================
- Coverage   67.87%   67.86%   -0.01%     
==========================================
  Files         441      441              
  Lines       41611    41648      +37     
==========================================
+ Hits        28242    28263      +21     
- Misses      10937    10950      +13     
- Partials     2432     2435       +3     

Flag	Coverage Δ
unittests	67.86% <62.26%> (-0.01%)	⬇️

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[ZiMengSheng]

/lgtm

[saintube]

/hold

[saintube]

/unhold

[shaloulcy]

/lgtm

[ZiMengSheng]

/lgtm

[hormes]

/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hormes

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