feat(plugin): allowing limit-conn to dynamically adapt to the BE rules

[wmdmomo]

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?

The PR will change the plugin under plugin/UI (limit-conn), allowing limit-conn to dynamically adapt to the back-end json rules.

Related issues

fix/resolve #1588

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

[netlify]

✔️ Deploy Preview for apisix-dashboard ready!

🔨 Explore the source changes: 2015ae7

🔍 Inspect the deploy log: https://app.netlify.com/sites/apisix-dashboard/deploys/610fd86c3cbf7000078ad1d6

😎 Browse the preview: https://deploy-preview-1990--apisix-dashboard.netlify.app/

[codecov-commenter]

Codecov Report

Merging #1990 (2015ae7) into master (5a581d3) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1990      +/-   ##
==========================================
+ Coverage   65.69%   65.77%   +0.07%     
==========================================
  Files         121      121              
  Lines        3204     3205       +1     
  Branches      778      778              
==========================================
+ Hits         2105     2108       +3     
+ Misses       1099     1097       -2     

Flag	Coverage Δ
frontend-e2e-test	65.77% <100.00%> (+0.07%)	⬆️

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

Impacted Files	Coverage Δ
web/src/components/Plugin/UI/limit-conn.tsx	100.00% <100.00%> (ø)
web/src/components/Plugin/UI/plugin.tsx	83.33% <100.00%> (ø)
web/src/helpers.tsx	72.13% <0.00%> (+3.27%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5a581d3...2015ae7. Read the comment docs.

[liuxiran]

@wmdmomo please fix conflict files when you have time thanks

[wmdmomo]

@liuxiran I have resolved the conflict.