[Feature request] NDropdown support template option

[cnguu]

This function solves the problem (这个功能解决的问题)

Custom rendering option

Expected API (期望的 API)

<template>
  <NDropdown>
    <template #trigger>
      <NButton>hover me</NButton>
    </template>

    <NDropdownOption>item 1</NDropdownOption>

    <RouterLink to="path">
      <NDropdownOption>item 2</NDropdownOption>
    </RouterLink>
  </NDropdown>
</template>

[07akioni]

We will never provide children API for dropdown, select or menu due to its horrible maintainability.

[fudiwei]

毛遂自荐 @skit/x.naive-ui，基于 Naive-UI 二次封装了 Dropdown 组件，支持插槽式的写法。