koordlet: refactor cgroup resource

[saintube]

Signed-off-by: saintube saintube@foxmail.com

Ⅰ. Describe what this PR does

Refactor the CgroupResource module. Implement system.Resource interface (proposed in #720 ) to support file operations on cgroups-v2.

Ⅱ. Does this pull request fix one issue?

part of #407

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

Base: 67.50% // Head: 67.64% // Increases project coverage by +0.14% 🎉

Coverage data is based on head (f1841f6) compared to base (e0e889f).
Patch coverage: 71.46% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #834      +/-   ##
==========================================
+ Coverage   67.50%   67.64%   +0.14%     
==========================================
  Files         219      224       +5     
  Lines       24988    25561     +573     
==========================================
+ Hits        16868    17291     +423     
- Misses       6942     7069     +127     
- Partials     1178     1201      +23     

Flag	Coverage Δ
unittests	67.64% <71.46%> (+0.14%)	⬆️

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

Impacted Files	Coverage Δ
pkg/koordlet/metriccache/storage_tables.go	57.14% <ø> (ø)
pkg/koordlet/metrics/common.go	68.96% <ø> (ø)
pkg/koordlet/metricsadvisor/collector.go	10.63% <0.00%> (-0.39%)	⬇️
.../koordlet/qosmanager/metricsquery/metrics_query.go	57.54% <ø> (ø)
pkg/util/system/resource.go	20.68% <20.68%> (ø)
pkg/koordlet/executor/types.go	31.48% <31.81%> (ø)
pkg/util/stat.go	64.28% <35.00%> (-16.80%)	⬇️
pkg/koordlet/runtimehooks/reconciler/reconciler.go	67.05% <60.00%> (+1.17%)	⬆️
...dlet/metricsadvisor/performance_collector_linux.go	69.56% <60.57%> (-7.97%)	⬇️
pkg/util/system/validator.go	64.70% <62.50%> (-35.30%)	⬇️
... and 24 more

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[hormes]

/lgtm

[zwzhang0107]

/assign @FillZpp

[FillZpp]

/approve
/hold
Please fix the conflicts.

[saintube]

/ping @zwzhang0107 @FillZpp

[FillZpp]

/lgtm
/hold cancel

[zwzhang0107]

/lgtm
/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: FillZpp, zwzhang0107

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• pkg/koordlet/OWNERS [zwzhang0107]
• pkg/util/OWNERS [FillZpp]

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[FillZpp]

/milestone v1.1