Feat: support to approve, terminate and rollback workflow by custom triggers

[NeerajGartia21]

Description of your changes

Fixes #734

This PR adds the support to approve, terminate and rollback workflow by custom triggers

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 yarn lint to ensure the frontend changes are ready for review.
• Run make reviewableto ensure the server changes are ready for review.
• Added backport release-x.y labels to auto-backport this PR if necessary.

Special notes for your reviewer

[codecov]

Codecov Report

Patch coverage: 65.00% and project coverage change: +0.10 🎉

Comparison is base (0ad6d36) 61.13% compared to head (826b051) 61.24%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #797      +/-   ##
==========================================
+ Coverage   61.13%   61.24%   +0.10%     
==========================================
  Files         109      109              
  Lines       19143    19209      +66     
==========================================
+ Hits        11703    11764      +61     
- Misses       5989     5991       +2     
- Partials     1451     1454       +3     

Flag	Coverage Δ
apiserver-unittests	33.83% <65.00%> (+0.02%)	⬆️
server-e2e-tests	49.71% <0.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
pkg/server/interfaces/api/dto/v1/types.go	73.33% <ø> (ø)
pkg/server/domain/service/webhook.go	66.03% <65.00%> (-0.45%)	⬇️

... and 10 files with indirect coverage changes

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[NeerajGartia21]

I think this PR is now ready for review.

[chivalryq]

Please rebase the master to run e2e test

[chivalryq]

Documents should be modified:

• https://kubevela.io/docs/how-to/dashboard/trigger/overview