Feat: enhanced horizontal scaling of app controller.

[fourierr]

Signed-off-by: Xiangbo Ma [email protected]

Description of your changes

Fixes https://github.com/kubevela/kubevela/issues/4596

Add sharding for app controller, and legacy app cr will be processed by sharding-1. I have:

• [x] Read and followed KubeVela's contribution process.
• [ ] Related Docs updated properly. In a new feature or configuration option, an update to the documentation is necessary.
• [x] Run make reviewable to ensure this PR is ready for review.
• [x] Added backport release-x.y labels to auto-backport this PR if necessary.

How has this code been tested

Special notes for your reviewer

[codecov[bot]]

Codecov Report

Merging #4705 (c1d01dd) into master (cea9ef5) will decrease coverage by 12.67%. The diff coverage is 7.14%.

@@             Coverage Diff             @@
##           master    #4705       +/-   ##
===========================================
- Coverage   60.85%   48.18%   -12.68%     
===========================================
  Files         322      266       -56     
  Lines       31725    28658     -3067     
===========================================
- Hits        19307    13809     -5498     
- Misses       9912    12887     +2975     
+ Partials     2506     1962      -544     

Flag	Coverage Δ
apiserver-e2etests	?
apiserver-unittests	40.48% <ø> (+0.03%)	:arrow_up:
core-unittests	55.10% <7.14%> (+0.13%)	:arrow_up:
e2e-multicluster-test	?
e2e-rollout-tests	?
e2etests	?

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

Impacted Files	Coverage Δ
cmd/core/main.go	9.46% <0.00%> (-0.24%)	:arrow_down:
...dev/v1alpha2/application/application_controller.go	55.91% <16.66%> (-30.91%)	:arrow_down:
pkg/apiserver/domain/service/service.go	0.00% <0.00%> (-92.31%)	:arrow_down:
pkg/workflow/workflow.go	0.00% <0.00%> (-91.31%)	:arrow_down:
pkg/apiserver/interfaces/api/velaql.go	4.16% <0.00%> (-83.34%)	:arrow_down:
pkg/controller/utils/actions.go	0.00% <0.00%> (-80.00%)	:arrow_down:
pkg/apiserver/interfaces/api/payload_types.go	5.55% <0.00%> (-77.78%)	:arrow_down:
pkg/auth/identity.go	0.00% <0.00%> (-75.52%)	:arrow_down:
pkg/resourcekeeper/containsresources.go	0.00% <0.00%> (-75.00%)	:arrow_down:
...v/v1alpha2/componentdefinition/mutating_handler.go	0.00% <0.00%> (-74.00%)	:arrow_down:
... and 209 more

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[Somefive]

Is it duplicated with #4618 ? Shall we close one?

[fourierr]

Is it duplicated with #4618 ? Shall we close one?

ok

[wonderflow]

closing as https://github.com/kubevela/kubevela/pull/5360 merged