feat: Add require-read-only-array rule (#236)

[pnevyk]

This rule enforces use of $ReadOnlyArray instead of Array or array
shorthand notation.

[pnevyk]

Well, right after I submitted this PR I noticed there is already one solving this issue. I am so sorry for this duplicate, it should be probably closed. Next time, I will pay more attention.

[gajus]

@pnevyk If you do not mind, I prefer your PR.

[pnevyk]

Ok, that's fine. And is there already a decision in points you noted in your PR (name no-array and detection of mutation in scope)?

[gajus]

detection of mutation in scope

No need. If user intends to perform a mutation, he will just suppress the warning. Otherwise, it is easy to perform accidental mutation without even being aware of this rule.

As for the rule name, "no-array" is a bit too generic. I think "no-mutable-array" would work the best.

[pnevyk]

@gajus So I renamed the rule to no-mutable-array. Is there anything to be done yet?

[gajus]

Thank you