docs: proposal koordlet support cgroups v2

[saintube]

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

Ⅰ. Describe what this PR does

Add a proposal that clarifies how to support cgroups v2 in the koordlet.

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

[FillZpp]

A few nits, and we shouldn't change any code in a proposal PR.

[codecov]

Codecov Report

Base: 68.15% // Head: 68.15% // No change to project coverage 👍

Coverage data is based on head (00e3c4d) compared to base (f653e7e).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #720   +/-   ##
=======================================
  Coverage   68.15%   68.15%           
=======================================
  Files         210      210           
  Lines       24102    24102           
=======================================
  Hits        16427    16427           
- Misses       6535     6536    +1     
+ Partials     1140     1139    -1     

Flag	Coverage Δ
unittests	68.15% <ø> (ø)

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

Impacted Files	Coverage Δ
pkg/koordlet/statesinformer/states_pods.go	54.60% <0.00%> (-2.13%)	⬇️
pkg/util/httputil/reverseproxy.go	85.10% <0.00%> (+0.79%)	⬆️

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[saintube]

A few nits, and we shouldn't change any code in a proposal PR.

OK. I will split this PR.

[saintube]

cc @zwzhang0107 @jasonliu747 @eahydra @hormes

[jasonliu747]

/lgtm

[saintube]

/cc @stormgbs

[zwzhang0107]

/lgtm

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[stormgbs]

(FYI) I think ResourceName maybe a better choice :)