feat: add hub leader config controller

[tnsimon]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Adds hubleader config controller to create configmap for the nodepool leader and pool scoped metadata

Which issue(s) this PR fixes:

Fixes #2260

Special notes for your reviewer:

/assign @rambohe-ch

Does this PR introduce a user-facing change?

NONE

other Note

An internal CRD would be an improvement than a configmap to have a structured schema. Endpoints resource was not used due to character limitations using annotations to store poolscoped metadata. It was decided to use a config map instead.

[codecov]

Codecov Report

Attention: Patch coverage is 29.65116% with 121 lines in your changes missing coverage. Please review.

Please upload report for BASE (master@ffb736a). Learn more about missing BASE report.
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...ller/hubleaderconfig/hubleaderconfig_controller.go	35.23%	64 Missing and 4 partials ⚠️
...t-manager/app/options/hubleaderconfigcontroller.go	0.00%	26 Missing ⚠️
pkg/yurtmanager/controller/base/controller.go	0.00%	17 Missing ⚠️
cmd/yurt-manager/app/options/options.go	0.00%	7 Missing ⚠️
cmd/yurt-manager/names/controller_names.go	0.00%	2 Missing ⚠️
pkg/projectinfo/projectinfo.go	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #2299   +/-   ##
=========================================
  Coverage          ?   45.30%           
=========================================
  Files             ?      410           
  Lines             ?    27152           
  Branches          ?        0           
=========================================
  Hits              ?    12301           
  Misses            ?    13627           
  Partials          ?     1224           

Flag	Coverage Δ
unittests	45.30% <29.65%> (?)

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[sonarqubecloud]

Quality Gate passed

Issues
0 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