feat: enforce spacing between functions

[ClementWalter]

Feature Request

Describe the Feature Request

The scarb fmt doesn't enforce a given number of lines between two functions. This means that both

fn a() {}

fn b() {}

fn a() {}


fn b() {}

are currently valid.

Describe Preferred Solution

Enforce either one or two lines spacing, but enforce!

If the feature request is approved, would you be willing to submit a PR?
(Help can be provided if you need assistance submitting a PR)

• Yes
• No