make yurthub can cache metadata for raven agent

[rambohe-ch]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:
/kind bug
/kind documentation
/kind enhancement
/kind good-first-issue
/kind feature
/kind question
/kind design
/sig ai
/sig iot
/sig network
/sig storage
/kind enhancement

What this PR does / why we need it:

make yurthub can cache metadata for raven agent

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

other Note

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In response to this:

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:
/kind bug
/kind documentation
/kind enhancement
/kind good-first-issue
/kind feature
/kind question
/kind design
/sig ai
/sig iot
/sig network
/sig storage
/kind enhancement

What this PR does / why we need it:

make yurthub can cache metadata for raven agent

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

other Note

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
1.1% Duplication

[codecov]

Codecov Report

Merging #1745 (3051b65) into master (fbd5058) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1745   +/-   ##
=======================================
  Coverage   50.81%   50.81%           
=======================================
  Files         165      165           
  Lines       19254    19254           
=======================================
  Hits         9783     9783           
  Misses       8554     8554           
  Partials      917      917           

Flag	Coverage Δ
unittests	50.81% <ø> (ø)

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

Files	Coverage Δ
pkg/yurthub/util/util.go	55.94% <ø> (ø)

[YTGhost]

/lgtm

[openyurt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rambohe-ch, YTGhost

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