feat (sysadvisor): get power data served by metric store sourced from malachite realtime metric server

[h-w-chen]

What type of PR is this?

Feature: power aware advisor uses realtime power data originally from malachite. It has 3 major parts:

• malachite client method to get power stats from metric service path realtime/power;
• malachite_realtime provisioner which samples (in higher frequency) using malachite client and saves power metric in metric store;
• a power reader adapted to get power data out of metric store;

What this PR does / why we need it:

part of power node agent, it is needed for power aware plugin to get the current power usage and hence identify whether further measures required to limit the power consumption comparing with the desired power target.

Which issue(s) this PR fixes:

NA

[codecov]

Codecov Report

Attention: Patch coverage is 60.65574% with 48 lines in your changes missing coverage. Please review.

Project coverage is 56.05%. Comparing base (4df549f) to head (6273a71).
Report is 17 commits behind head on main.

Files with missing lines	Patch %	Lines
...tric/provisioner/malachite/realtime_provisioner.go	50.81%	25 Missing and 5 partials ⚠️
...etric/provisioner/malachite/client/client_power.go	73.52%	6 Missing and 3 partials ⚠️
...gin/poweraware/reader/metric_store_power_reader.go	65.21%	7 Missing and 1 partial ⚠️
.../agent/sysadvisor/plugin/poweraware/power_aware.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #720      +/-   ##
==========================================
+ Coverage   55.91%   56.05%   +0.13%     
==========================================
  Files         593      597       +4     
  Lines       67813    67958     +145     
==========================================
+ Hits        37918    38094     +176     
+ Misses      25859    25807      -52     
- Partials     4036     4057      +21     

Flag	Coverage Δ
unittest	56.05% <60.65%> (+0.13%)	⬆️

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