[Rule change] Let `ban-name` ban things like `DateTime.now`

[fzyzcjy]

To allow testability, it would be great to ban all DateTime.now and use clock.now instead. Thus, we can extend ban-name to do so.

What rule do you want to change?

How will the change be implemented? (New option, new default behavior, etc.)?

Please provide some example code that this change will affect:

What does the rule currently do for this code?

What will the rule do after it's changed?

Are you willing to submit a pull request to implement this change?

[incendial]

Available in 5.1.0 🚀