support search by item

[lepdou]

What's the purpose of this PR

support search by item

step 1 : input item key

step2 : jump to target namespace

Which issue(s) this PR fixes:

Fixes #

Brief changelog

XXXXX

Follow this checklist to help us incorporate your contribution quickly and easily:

• Read the Contributing Guide before making this pull request.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit tests to verify the code.
• Run mvn clean test to make sure this pull request doesn't break anything.
• Update the CHANGES log.

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[codecov-commenter]

Codecov Report

Merging #3977 (d650ef5) into master (debf749) will increase coverage by 0.03%.
The diff coverage is 63.15%.

@@             Coverage Diff              @@
##             master    #3977      +/-   ##
============================================
+ Coverage     51.17%   51.21%   +0.03%     
- Complexity     2494     2500       +6     
============================================
  Files           481      482       +1     
  Lines         14723    14776      +53     
  Branches       1521     1527       +6     
============================================
+ Hits           7534     7567      +33     
- Misses         6663     6678      +15     
- Partials        526      531       +5     

Impacted Files	Coverage Δ
...o/adminservice/controller/NamespaceController.java	14.70% <0.00%> (-1.43%)	⬇️
...trip/framework/apollo/biz/service/ItemService.java	14.86% <0.00%> (-0.21%)	⬇️
...framework/apollo/biz/service/NamespaceService.java	63.68% <0.00%> (-1.84%)	⬇️
...k/apollo/portal/component/config/PortalConfig.java	24.70% <0.00%> (-0.30%)	⬇️
...mework/apollo/portal/controller/AppController.java	26.82% <0.00%> (+0.94%)	⬆️
...ip/framework/apollo/portal/service/AppService.java	17.80% <ø> (ø)
...mework/apollo/portal/service/NamespaceService.java	67.50% <0.00%> (-0.43%)	⬇️
...p/framework/apollo/portal/api/AdminServiceAPI.java	12.43% <33.33%> (+0.70%)	⬆️
...ork/apollo/portal/controller/SearchController.java	87.17% <87.17%> (ø)
.../apollo/internals/RemoteConfigLongPollService.java	77.10% <0.00%> (-1.21%)	⬇️
... and 2 more

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[nobodyiam]

This feature looks great! Please find some comments below.

[lepdou]

I have read the CLA Document and I hereby sign the CLA

[nobodyiam]

LGTM