Add endColumn to no-useless-escape

[YodaDaCoda]

What rule do you want to change? no-useless-escape

Does this change cause the rule to produce more or fewer warnings? no

How will the change be implemented? (New option, new default behavior, etc.)? New default behaviour: return an endColumn

Please provide some example code that this change will affect:

var regex = /[\.]/;

What does the rule currently do for this code? Currently, the rule correctly detects an issue with the code. However, since the rule doesn't return an endColumn, my IDE (Atom) highlights until the end of the line in this example (from my testing, I think it highlights until the end of the line, or until the next \), which makes for a rather confusing UX.

What will the rule do after it's changed? Return an endColumn

Are you willing to submit a pull request to implement this change? No

[platinumazure]

Thanks @YodaDaCoda for creating a new issue!

Personally I'm on the fence about whether this should be a bug fix or an enhancement. In any event, I will champion this change.

[kaicataldo]

This is now accepted.