feat: tag and category add save and continue button

[LonelySnowman]

What type of PR is this?

/kind feature

What this PR does / why we need it:

文章分类和标签 Modal 添加 ”保存并继续添加” 按钮，便于连续添加。

Which issue(s) this PR fixes:

Fixes #6127

Special notes for your reviewer:

Does this PR introduce a user-facing change?

文章分类和标签的编辑表单支持保存并继续添加。

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.05%. Comparing base (bc10336) to head (85c16cf).
Report is 54 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6223      +/-   ##
============================================
+ Coverage     54.51%   58.05%   +3.54%     
- Complexity     3523     3757     +234     
============================================
  Files           646      649       +3     
  Lines         21862    22022     +160     
  Branches       1528     1547      +19     
============================================
+ Hits          11917    12785     +868     
+ Misses         9328     8618     -710     
- Partials        617      619       +2     

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[ruibaby]

感谢参与贡献，这里有两个体验的问题：

1. 提交的时候两个按钮都会有加载状态，期望只显示一个。可以考虑在按钮的 loading 属性上也加上 keepAddingSubmit 条件。

   

2. 保存并继续添加 按钮建议放在提交旁边，如果三个按钮同时放在一起不好看，可以考虑将 取消 按钮放置在最右边，类似于：

   <div class="flex justify-between">
      <VSpace>
        <VButton>提交</VButton>
        <VButton>提交并继续添加</VButton>
      </VSpace>
      <VButtion>关闭</VButton>
   </div>

[LonelySnowman]

@ruibaby 在一个按钮 loading 过程中需要对另一个按钮禁用么，如果用户在一个按钮加载时又去触发另一个按钮会导致表单提交两次。

[ruibaby]

@ruibaby 在一个按钮 loading 过程中需要对另一个按钮禁用么，如果用户在一个按钮加载时又去触发另一个按钮会导致表单提交两次。

那可以直接给按钮的 disabled 属性设置 saving。

[ruibaby]

/lgtm

Thanks

[f2c-ci-robot]

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