memory headroom canonical policy support enable buffer

[luomingmeng]

What type of PR is this?

Features

What this PR does / why we need it:

Current canonical memory headroom policy only consider the memory estimation of non-reclaimed QoS container, and uses the RSS memory to estimate, which may trigger memory reclamation frequently when shared or dedicated QoS container use much more cache and shmem in high load case, so we also need consider them in memory estimation and add extra memory margin.
In the low load case, the machine has enough free memory, the extra memory margin or cache can also oversold to reclaimed QoS worklaod to increase memory utilization.

[codecov]

Codecov Report

Patch coverage: 65.20% and project coverage change: +0.25 🎉

Comparison is base (21d86d9) 51.30% compared to head (cf765bd) 51.55%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
+ Coverage   51.30%   51.55%   +0.25%     
==========================================
  Files         318      330      +12     
  Lines       32418    33312     +894     
==========================================
+ Hits        16632    17175     +543     
- Misses      13840    14117     +277     
- Partials     1946     2020      +74     

Flag	Coverage Δ
unittest	51.55% <65.20%> (+0.25%)	⬆️

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

Impacted Files	Coverage Δ
pkg/agent/qrm-plugins/cpu/dynamicpolicy/policy.go	38.32% <0.00%> (-0.03%)	⬇️
...ourcemanager/fetcher/kubelet/topology/interface.go	0.00% <0.00%> (ø)
...nt/sysadvisor/plugin/qosaware/reporter/reporter.go	39.00% <0.00%> (-37.55%)	⬇️
pkg/client/control/cnr.go	37.80% <0.00%> (-1.94%)	⬇️
pkg/config/agent/global/base.go	100.00% <ø> (ø)
pkg/util/general/error.go	0.00% <0.00%> (ø)
...ysadvisor/plugin/qosaware/server/cpu/cpu_server.go	54.26% <2.00%> (-1.40%)	⬇️
.../agent/resourcemanager/reporter/cnr/cnrreporter.go	61.20% <27.58%> (-3.06%)	⬇️
pkg/agent/resourcemanager/reporter/converter.go	33.33% <33.33%> (ø)
pkg/metaserver/agent/cnr/cnr_stub.go	60.00% <33.33%> (-40.00%)	⬇️
... and 41 more

... and 17 files with indirect coverage changes

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