Add LivestatePlugin to implement Livestate/DriftDetection with SDK

[Warashi]

What this PR does:

This PR adds the interface definition of LivestatePlugin and the codes to run it.

Why we need it:

To implement livestate feature with SDK

Which issue(s) this PR fixes:

Part of #5530

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 32 lines in your changes missing coverage. Please review.

Project coverage is 26.22%. Comparing base (c1a62c5) to head (171de2e).
Report is 15 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/plugin/sdk/livestate.go	0.00%	20 Missing ⚠️
pkg/plugin/sdk/sdk.go	0.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5603      +/-   ##
==========================================
- Coverage   26.27%   26.22%   -0.05%     
==========================================
  Files         474      475       +1     
  Lines       50475    50528      +53     
==========================================
- Hits        13263    13253      -10     
- Misses      36150    36212      +62     
- Partials     1062     1063       +1     

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[t-kikuc]

LGTM
Let's try

[ffjlabo]

Lt's try