some advise

[seth-shi]

1. add a Dispose function cmd (likely Close()), but return a tea.Cmd
2. add a onDataInit, use async load data

func (m *tea.Model) onDataInit() tea.Cmd{
      return func() tea.Msg {
          fetch http data
    }
}

func (m *tea.Model) onDataInited() {
     
      m.data = fetch http data
      m.loading = false
}

func (m *tea.Model) Dispose() tea.Msg {
      return dosomething
}

func (m *tea.Model) View() {
 if m.loading {
    return "loading'
 }


  return m.data
}