feature: modify item comment valid size(#3799)

[chengasd]

What's the purpose of this PR

修改openapi创建item校验的comment长度大小，兼容历史业务场景升级。

Which issue(s) this PR fixes:

Fixes #3799

Brief changelog

1、openapi入口ItemController.java comment校验长度大小改为256
2、portal前端入口valdr.js comment长度大小同步改为256
3、en.json 、zh-CN.json 修改对应数值

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• 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 ✍️ ✅

[nobodyiam]

Comment length 1024 might be a little big, I noticed the comment length limit for release is 256 in the database, how about we increase both limits to 256 first?

[chengasd]

Comment length 1024 might be a little big, I noticed the comment length limit for release is 256 in the database, how about we increase both limits to 256 first?

ok , It's done

[codecov-commenter]

Codecov Report

Merging #3803 (03c59fb) into master (39aa560) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##             master    #3803   +/-   ##
=========================================
  Coverage     50.13%   50.13%           
- Complexity     2443     2444    +1     
=========================================
  Files           479      479           
  Lines         14807    14807           
  Branches       1503     1503           
=========================================
+ Hits           7423     7424    +1     
  Misses         6860     6860           
+ Partials        524      523    -1     

Impacted Files	Coverage Δ
...k/apollo/openapi/v1/controller/ItemController.java	8.16% <0.00%> (ø)
...work/apollo/biz/message/ReleaseMessageScanner.java	73.33% <0.00%> (-4.45%)	⬇️
...ervice/service/ReleaseMessageServiceWithCache.java	87.05% <0.00%> (+1.17%)	⬆️
.../apollo/internals/RemoteConfigLongPollService.java	78.31% <0.00%> (+1.20%)	⬆️

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[nobodyiam]

LGTM