fix(vue): fix reactions not work correctly in schema field

[MisicDemone]

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该PR影响的场景，当SchemaField作为某组件子元素时，外层会比之前多一个 display:contents 的 div 元素(替换了原本产生问题的Fragment组件)，对于某些会检测子元素个数的父组件会有影响。例如:

<FormProvider :form="form">
  <FormGrid>
    <SchemaField :schema="schema" />
    <OtherFields />
  </FormGrid>
</FormProvider>

FormGrid 会根据子元素个数给定不同的默认值，在以上场景，手动设置 minColumns 等属性可保证前后表现一致。

[MisicDemone]

关联issue：#3262