Create plugin/base branch to act as boilerplate for new plugins

[ajatprabha]

This PR is in an early stage to close #1832

What's Missing:

• Installation and serving mechanism from the backend(Plugin controller to manage plugin source from dashboard backend #4017)
• Ability to import and mount bundled plugin in the browser based on a config generated by the backend
• Support plugins on the backend as a CRD for easy installation
• Error Handling
  ...and a lot of other things which shall be added as progress is made.

[codecov]

Codecov Report

Merging #4013 into plugin/base will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           plugin/base    #4013   +/-   ##
============================================
  Coverage        47.28%   47.28%           
============================================
  Files              182      182           
  Lines             8400     8400           
  Branches            71       71           
============================================
  Hits              3972     3972           
  Misses            4183     4183           
  Partials           245      245

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[codecov]

Codecov Report

Merging #4013 into plugin/base will increase coverage by 0.22%.
The diff coverage is 25.31%.

@@              Coverage Diff               @@
##           plugin/base   #4013      +/-   ##
==============================================
+ Coverage        46.18%   46.4%   +0.22%     
==============================================
  Files              194     188       -6     
  Lines             8999    8708     -291     
  Branches            83      71      -12     
==============================================
- Hits              4156    4041     -115     
+ Misses            4587    4417     -170     
+ Partials           256     250       -6

Impacted Files	Coverage Δ
src/app/backend/api/types.go	56% <ø> (ø)	⬆️
...tend/common/components/workloadstatus/component.ts	87.5% <ø> (ø)	⬆️
...ckend/resource/customresourcedefinition/objects.go	0% <0%> (ø)	⬆️
...ackend/resource/customresourcedefinition/client.go	0% <0%> (ø)	⬆️
...ackend/resource/customresourcedefinition/detail.go	0% <0%> (ø)	⬆️
...rc/app/backend/resource/common/resourcechannels.go	0% <0%> (ø)	⬆️
...ackend/resource/customresourcedefinition/events.go	100% <100%> (ø)	⬆️
src/app/frontend/overview/component.ts	56.86% <100%> (-13.73%)	⬇️
...ackend/resource/customresourcedefinition/common.go	20.83% <20.83%> (+1.96%)	⬆️
src/app/backend/handler/apihandler.go	27.18% <21.05%> (+0.1%)	⬆️
... and 38 more

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[ajatprabha]

PTAL @floreks @maciaszczykm

[maciaszczykm]

Checking it.

[maciaszczykm]

/approve
/cc @floreks

LGTM if okay for you.

[floreks]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ajatprabha, floreks, maciaszczykm

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