feat(desc): add `<SDescAvatar>` (#455)

[kiaking]

• close #455

At the moment, I'm limiting this component to show only 1 user. Not sure yet how to display multiple users, especially combined with their names 🤔

<SDescItem span="2">
  <SDescLabel>Account</SDescLabel>
  <SDescAvatar
    :avatar="{
      avatar: 'https://i.pravatar.cc/64?img=1',
      name: 'margot.foster'
    }"
  />
</SDescItem>

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