Add suffix slot to <a-input-number>

[rowanwins]

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• [x] I have searched the issues of this repository and believe that this is not a duplicate.
  • related to https://github.com/vueComponent/ant-design-vue/issues/6777 which was closed due to being stale

What problem does this feature solve?

Currently <a-input> has a suffix slot, however <a-input-number/> does not, limiting more advanced layouts. The current addon-after prop has some opinionated styling which makes it less useful than the bare suffix slot.

Here is an example of the field layout I am making

What does the proposed API look like?

API as per <a-input/>

<a-input-number>
  <template #suffix>
     <p>extra content</p>
  </template>
<a-input-number>