chore: update Service module

[juzhiyuan]

Please answer these questions before submitting a pull request, or your PR will get closed.

Why submit this pull request?

• Bugfix
• New feature provided
• Improve performance
• Backport patches

What changes will this PR take into?

• added Service description;
• update Service Creator's fields

Checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[codecov-io]

Codecov Report

Merging #1749 (8a2625b) into master (8b6080d) will decrease coverage by 0.90%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1749      +/-   ##
==========================================
- Coverage   72.45%   71.54%   -0.91%     
==========================================
  Files         132       47      -85     
  Lines        5721     3128    -2593     
  Branches      649        0     -649     
==========================================
- Hits         4145     2238    -1907     
+ Misses       1334      646     -688     
- Partials      242      244       +2     

Flag	Coverage Δ
backend-e2e-test	62.30% <ø> (-0.42%)	⬇️
backend-e2e-test-ginkgo	49.23% <ø> (+0.12%)	⬆️
backend-unit-test	52.29% <ø> (ø)
frontend-e2e-test	?

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

Impacted Files	Coverage Δ
api/internal/core/store/storehub.go	71.02% <0.00%> (-3.74%)	⬇️
api/internal/core/storage/etcd.go	47.27% <0.00%> (-3.64%)	⬇️
api/internal/core/store/store.go	87.95% <0.00%> (-1.21%)	⬇️
...pages/SSL/components/CertificateUploader/index.tsx
...ages/Route/components/DebugViews/DebugDrawView.tsx
web/src/pages/Consumer/components/Step1.tsx
web/src/pages/Service/service.ts
web/src/helpers.tsx
web/src/pages/Dashboard/service.ts
web/src/pages/Consumer/Create.tsx
... and 75 more

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[juzhiyuan]

ping @LiteSun @bzp2010

[starsz]

Description LGTM