refactor(qrm): refactor the state module for enhanced extensibility

[xu282934741]

What type of PR is this?

What this PR does / why we need it:

if we want to add a new strategy, this refactoring will be helpful.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Attention: Patch coverage is 86.53846% with 7 lines in your changes missing coverage. Please review.

Project coverage is 57.21%. Comparing base (fcb8f49) to head (8cbe21e).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
.../agent/qrm-plugins/cpu/dynamicpolicy/state/util.go	87.17%	3 Missing and 2 partials ⚠️
pkg/agent/qrm-plugins/cpu/dynamicpolicy/policy.go	0.00%	1 Missing ⚠️
pkg/agent/qrm-plugins/cpu/nativepolicy/policy.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #697      +/-   ##
==========================================
+ Coverage   57.09%   57.21%   +0.12%     
==========================================
  Files         568      568              
  Lines       54678    54760      +82     
==========================================
+ Hits        31217    31333     +116     
+ Misses      19553    19502      -51     
- Partials     3908     3925      +17     

Flag	Coverage Δ
unittest	57.21% <86.53%> (+0.12%)	⬆️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.