$post and $get helpers to wrap around $fetch

[KevinBatdorf]

To do a post request you do:

$fetch({
  method: 'post',
  url: '/user/12345',
  data: {
    firstName: 'Fred',
    lastName: 'Flintstone'
  }
})

This is fine, but better would be:

$post(url, options)

$fetch defaults to "get" but if we add $post it makes sense to have $get too

[SimoTod]

It makes sense and it's probably just a few bytes. I wonder if they should just be $post(url, data) and $get(url) to cover the simple cases.
For example

$post(
  '/user/12345'​,​
  {​​firstName​: ​'Fred'​, lastName​: ​'Flintstone'​}
)

If someone needs to pass custom options, they can use the full featured $fetch.