Rule proposal: Enforce blank lines around tests

[jdoubleu]

It would be nice to have a rule which enforces blank links around it() test statements.

I expect the rule to disallow:

...
it('should do something', () => {
  ...
})
it('should test other thing', () => {
})

But allows:

...
it('should do something', () => {
  ...
})

it('should test other thing', () => {
})

This is similar to the padding-line-between-statements ESLint rule but is more specific about the statement (i.e. it() function call).

[lo1tuma]

Duplicate of #145.