feat: add choices support function

[zhangfisher]

prompt Select、multiselect、autocomplete、autocompleteMultiselect 's choices parameter supports functions
eg.

  const response = await prompts([
    {
      type: 'text',
      name: 'twitter',
      message: `What's your twitter handle?`
    },
    {
      type: 'multiselect',
      name: 'color',
      message: 'Pick colors',
+      choices: ()=>[                  
+           { title: 'Red', value: '#ff0000' },
+           { title: 'Green', value: '#00ff00' },
+           { title: 'Blue', value: '#0000ff' }
+       ],
    }
  ]);