Rule change proposal: no-useless-undefined add option to skip checking arrow function body

[fisker]

Sometimes it's more clear to use () => undefined than () => {},

/~https://github.com/babel/babel/pull/15547/files#diff-27084e8878ce0b72bf5cd31ec6a0a719096f981bcfa32ca71a57a0f35fb84676R64

const {foo = () => {}} = {};
const {foo = () => undefined} = {};

const {
  foo = () => {},
  bar = () => ({})
} = {};
const {
  foo = () => undefined,
  bar = () => ({})
} = {};

Suggest add option checkArrowFunctionBody: false.