Add evaluating command to nef

[miguelangel-dev]

Description

Let nef evaluate the code, not only verify it compiles, but also runs it.

Sample usage

nef run --project <nef playground>

Input:

import Bow

let either = Either<String, Int>.left("Hi!")
print(either)

Output:

.left("Hi!")

Modules

UI

• NefRun

Component

• update public API in nef
• NefRun
• NefModels

Breaking changes