add support to define kcmas metric dynamically

[waynepeking348]

What type of PR is this?

enhancements

What this PR does / why we need it:

add cpu-usage in default metric and make it dynamic to add new metric names

[codecov]

Codecov Report

Patch coverage: 78.12% and project coverage change: +0.35 🎉

Comparison is base (20bae0a) 50.25% compared to head (9906244) 50.60%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #155      +/-   ##
==========================================
+ Coverage   50.25%   50.60%   +0.35%     
==========================================
  Files         393      399       +6     
  Lines       37767    38015     +248     
==========================================
+ Hits        18978    19236     +258     
+ Misses      16642    16623      -19     
- Partials     2147     2156       +9     

Flag	Coverage Δ
unittest	50.60% <78.12%> (+0.35%)	⬆️

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

Impacted Files	Coverage Δ
...sysadvisor/metric-emitter/metric_emitter_plugin.go	43.10% <0.00%> (-8.98%)	⬇️
pkg/metaserver/agent/metric/helper/pod.go	68.42% <68.42%> (ø)
...in/qosaware/resource/memory/plugin/memory_guard.go	69.38% <69.38%> (ø)
...advisor/plugin/qosaware/resource/memory/advisor.go	78.91% <70.90%> (+5.70%)	⬆️
pkg/metaserver/agent/metric/helper/system.go	72.30% <72.30%> (ø)
pkg/metaserver/agent/metric/helper/container.go	73.33% <73.33%> (ø)
...sadvisor/plugin/metric-emitter/syncer/node/node.go	42.16% <83.33%> (+2.92%)	⬆️
...sysadvisor/plugin/metric-emitter/syncer/pod/pod.go	66.44% <83.33%> (+0.90%)	⬆️
...in/qosaware/resource/memory/plugin/cache_reaper.go	91.30% <91.30%> (ø)
...n/qosaware/resource/memory/plugin/memset_binder.go	92.50% <92.50%> (ø)
... and 7 more

... and 10 files with indirect coverage changes

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