Feat: update sharding using pkg

[Somefive]

Signed-off-by: Somefive yd219913@alibaba-inc.com

Description of your changes

Fixes #

I have:

• 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.
• Run make reviewable to ensure this PR is ready for review.
• 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]

Codecov Report

Base: 57.41% // Head: 59.41% // Increases project coverage by +2.00% 🎉

Coverage data is based on head (9550bdc) compared to base (46d762f).
Patch coverage: 0.00% of modified lines in pull request are covered.

❗ Current head 9550bdc differs from pull request most recent head 38e27c9. Consider uploading reports for the commit 38e27c9 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5430      +/-   ##
==========================================
+ Coverage   57.41%   59.41%   +2.00%     
==========================================
  Files         315      305      -10     
  Lines       47307    46933     -374     
==========================================
+ Hits        27160    27885     +725     
+ Misses      17335    16126    -1209     
- Partials     2812     2922     +110     

Flag	Coverage Δ
apiserver-e2etests	35.61% <0.00%> (+0.11%)	⬆️
apiserver-unittests	36.31% <ø> (?)
core-unittests	55.29% <0.00%> (+0.11%)	⬆️
e2e-multicluster-test	?
e2e-rollout-tests	20.72% <0.00%> (+0.09%)	⬆️
e2etests	26.20% <0.00%> (+0.10%)	⬆️

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

Impacted Files	Coverage Δ
cmd/core/app/options/options.go	92.79% <ø> (ø)
cmd/core/app/server.go	52.29% <0.00%> (-6.43%)	⬇️
...ller/core.oam.dev/v1alpha2/application/revision.go	69.58% <ø> (-2.20%)	⬇️
pkg/resourcetracker/app.go	86.80% <ø> (ø)
pkg/utils/app/reschedule.go	64.28% <ø> (ø)
...e.oam.dev/v1alpha2/application/mutating_handler.go	74.32% <0.00%> (-12.17%)	⬇️
...ok/core.oam.dev/v1alpha2/application/validation.go	82.85% <ø> (-2.86%)	⬇️
pkg/monitor/watcher/application.go	0.00% <0.00%> (-97.06%)	⬇️
pkg/auth/identity.go	8.45% <0.00%> (-67.61%)	⬇️
pkg/resourcetracker/tree.go	18.49% <0.00%> (-53.97%)	⬇️
... and 89 more

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