add nodebucket crd and controller

[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 feature

What this PR does / why we need it:

1. add NodeBucket CRD
2. add nodebucket controller for managing NodeBucket resource.
3. one NodeBucket can store 100 nodes info by default. and parameter --max-nodes-per-bucket can be used for configuring the number of nodes in NodeBucket.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

other Note

[codecov]

Codecov Report

Attention: 100 lines in your changes are missing coverage. Please review.

Comparison is base (81d21b7) 52.16% compared to head (ff928df) 52.25%.

Files	Patch %	Lines
...ger/controller/nodebucket/nodebucket_controller.go	59.18%	92 Missing and 8 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1874      +/-   ##
==========================================
+ Coverage   52.16%   52.25%   +0.09%     
==========================================
  Files         172      173       +1     
  Lines       20874    21119     +245     
==========================================
+ Hits        10888    11035     +147     
- Misses       9018     9109      +91     
- Partials      968      975       +7     

Flag	Coverage Δ
unittests	52.25% <59.18%> (+0.09%)	⬆️

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[rambohe-ch]

@JameKeal PTAL

[JameKeal]

@JameKeal PTAL

I review the code, the major logic has no problems.

[JameKeal]

please resolve the conflict files.

[sonarqubecloud]

Quality Gate passed

The SonarCloud Quality Gate passed, but some issues were introduced.

2 New issues
0 Security Hotspots
No data about Coverage
0.1% Duplication on New Code

See analysis details on SonarCloud