In this patch we now consider props to be on the same "line" if the line
of where one prop ends matches the line of where the next prop begins.

e.g.
```
<App foo={{
}} bar />
```

`foo` and `bar` are now considered to be on the same line. Previously,
we would only look at the line in which the prop begins.

If `when` is set to `multiline`, then this rule skips checking entirely
if the jsx opening tag is a single line.

Defaults `when` to `always` which is the current behavior.

Make sure it works when a prop is on the same line as the start line of
the tag, as well as with spread props that spans multiple lines.

To be consistent with the "Rule Options" section and other docs