Feature request: prefix / suffix function support

[GHNewbiee]

The case
A wish to conditionally display the answer line separate of that of the question line.

The problem
Although suffix: '\n' can be used, sometimes it is not convenient when answer returns nothing.

Potential solution
A prefix / suffix function support will give more freedom to styling.

Example

import inquirer from "inquirer";

inquirer
  .prompt([
    {
      type: 'checkbox',
      name: 'fruits',
      message: 'Select the fruits you like:',
      default: ['apple', 'apricot', 'banana', 'mandarin', 'orange'] ,
      choices: ['apple', 'apricot', 'banana', 'mandarin', 'orange'],
      prefix: '',
      suffix: answers => answers.fruits.length === 0 ? '' : '\n  ',
    },
  ])
  .then(() => {
    ...
  })

? Select the fruits you like:
  orange
? Next question

And, instead of

? Select the fruits you like:

? Next question

next is better:

? Select the fruits you like:
? Next question

Tia