prevent-abbreviations: Add ignore option

[fisker]

Fixes #567
Fixes #752

Maybe we can remove whitelist option later.

[futpib]

I think we could solve those issues by fixing whitelist and without introducing regexps or a second ignore option.

We could make whitelist match any subsequence of the split identifier. For example (following up this #567 (comment)):
For fooE2eBar all of these would be checked against whitelist:

• foo
• e
• 2
• bar
• barE
• e2
• 2e
• eBar
• fooE2
• e2e
• 2eBar
• fooE2e
• e2eBar
• fooE2eBar

And if any of them is in the whitelist that subsequence is ignored.

But in my opinion it should not ignore the whole identifier if only subsequence matches whitelist.

For example, if the user had e2e in their whitelist, e2eErr should still be fixed to e2eError.

[fisker]

I don't think there is a good solution for these cases, #567 has been there for a long time.

Instead of blocking people use this rule, I believe give an option to let them use on there own risk is the right thing to do.

[sindresorhus]

@futpib Can you open a new issue for your above comment? I think we should improve this rule, but I also think it's valuable to let users easily ignore things like this. There might be other cases we just cannot fix and this option lets user ignore instead of having to disable the whole rule.