feat: add dynamic list input

[LIlGG]

What type of PR is this?

/kind feature
/area ui
/milestone 2.17.x

What this PR does / why we need it:

为 formkit 增加动态列表的 input。

使用方式：

- $formkit: list
  name: users
  label: Users
  addLabel: Add User
  min: 1
  max: 3
  itemType: string
  children:
    - $formkit: text
      index: "$index"
      validation: required

Note

list 组件有且只有一个子节点，并且必须为子节点传递 index 属性。若想提供多个字段，则建议使用 group 组件包裹。

How to test it?

测试动态数组是否正常可用。保存的结果是否为 {users: ["", ""]}

Which issue(s) this PR fixes:

Fixes #6098

Does this PR introduce a user-facing change?

为 Formkit 增加动态列表的组件

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.04%. Comparing base (5fdf6c0) to head (93e11ac).
Report is 268 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6146      +/-   ##
============================================
- Coverage     56.91%   55.04%   -1.88%     
- Complexity     3319     3490     +171     
============================================
  Files           587      635      +48     
  Lines         18968    21388    +2420     
  Branches       1401     1496      +95     
============================================
+ Hits          10795    11772     +977     
- Misses         7594     9010    +1416     
- Partials        579      606      +27     

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[ruibaby]

/lgtm

[JohnNiang]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang

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• ui/OWNERS [JohnNiang]

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