feat: add hub election leader controller

[tnsimon]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Add hub leader election controller

Which issue(s) this PR fixes:

Fixes #2259

Special notes for your reviewer:

/assign @rambohe-ch

Does this PR introduce a user-facing change?

NONE

other Note

[codecov]

Codecov Report

Attention: Patch coverage is 40.09901% with 121 lines in your changes missing coverage. Please review.

Project coverage is 45.85%. Comparing base (d690808) to head (1995b3d).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...nager/controller/hubleader/hubleader_controller.go	56.25%	53 Missing and 3 partials ⚠️
...rtmanager/controller/util/node/controller_utils.go	8.82%	31 Missing ⚠️
...md/yurt-manager/app/options/hubleadercontroller.go	0.00%	24 Missing ⚠️
cmd/yurt-manager/app/options/options.go	0.00%	6 Missing ⚠️
pkg/apis/apps/v1beta2/default.go	0.00%	2 Missing ⚠️
pkg/apis/apps/v1alpha1/nodepool_conversion.go	0.00%	1 Missing ⚠️
pkg/apis/apps/v1beta1/nodepool_conversion.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2281      +/-   ##
==========================================
- Coverage   46.39%   45.85%   -0.55%     
==========================================
  Files         416      418       +2     
  Lines       27266    27450     +184     
==========================================
- Hits        12651    12586      -65     
- Misses      13335    13611     +276     
+ Partials     1280     1253      -27     

Flag	Coverage Δ
unittests	45.85% <40.09%> (-0.55%)	⬇️

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[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[rambohe-ch]

/LGTM