fix: generate an uid when post a route without id

[starsz]

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

Why submit this pull request?

This PR is to fix this situation:
when creating the route with the script, but without the id.The original logic will return the key is required.

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

What changes will this PR take into?

Fix the situation:
When creating the route with the script, but without the id.The original logic will return the key is required.

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

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[codecov-commenter]

Codecov Report

Merging #1883 (8e97cf3) into master (b1e66a2) will decrease coverage by 5.56%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1883      +/-   ##
==========================================
- Coverage   72.10%   66.54%   -5.57%     
==========================================
  Files         125      173      +48     
  Lines        2947     6208    +3261     
  Branches      711      712       +1     
==========================================
+ Hits         2125     4131    +2006     
- Misses        822     1755     +933     
- Partials        0      322     +322     

Flag	Coverage Δ
backend-e2e-test	45.76% <0.00%> (?)
backend-e2e-test-ginkgo	48.40% <100.00%> (?)
frontend-e2e-test	72.47% <ø> (+0.36%)	⬆️

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

Impacted Files	Coverage Δ
api/internal/handler/route/route.go	67.75% <100.00%> (ø)
api/internal/core/storage/etcd.go	47.27% <0.00%> (ø)
api/internal/route.go	85.29% <0.00%> (ø)
api/internal/core/store/validate.go	55.86% <0.00%> (ø)
api/internal/conf/conf.go	61.03% <0.00%> (ø)
api/internal/log/log.go	50.00% <0.00%> (ø)
api/internal/utils/runtime/runtime.go	0.00% <0.00%> (ø)
api/internal/utils/json_patch.go	44.82% <0.00%> (ø)
.../internal/handler/authentication/authentication.go	88.23% <0.00%> (ø)
api/internal/handler/global_rule/global_rule.go	64.51% <0.00%> (ø)
... and 42 more

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[juzhiyuan]

Hi, this file seems doesn't test script field?

[starsz]

The request body was contained in dag-conf.json.Also include the script field.
You can see this file line 32.

bytes, err := ioutil.ReadFile("../../testdata/dag-conf.json")