feat(vue): nested menu component

[vaakian]

Support component usage:

<MenuGroup>
      <MenuItem>Item 1</MenuItem>
      <MenuItem>Item 2</MenuItem>
      <MenuItem>
        SubMenu1
        <!-- sub menu content -->
        <MenuGroup>
          <MenuItem>Nested1</MenuItem>
          <MenuItem>Nested2</MenuItem>
          <MenuItem>
            SubMenu2
            <!-- deep sub menu content -->
            <MenuGroup>
              <MenuItem>Apple</MenuItem>
              <MenuItem>Orange</MenuItem>
              <MenuItem>Banana</MenuItem>
            </MenuGroup>
          </MenuItem>
        </MenuGroup>
      </MenuItem>
    </MenuGroup>

[vercel]

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Name	Status	Preview	Updated
contextmenu	✅ Ready (Inspect)	Visit Preview	Oct 5, 2022 at 4:56PM (UTC)

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[vaakian]

get MenuGroup / MenuItem instance using ref