Request: Allow to add method arguments to Metrics/MethodLength CountAsOne

[hacktivista]

Is your feature request related to a problem? Please describe.

I tend to write

method(
  param1, param2, param3
)

Instead of

method(
  param1,
  param2,
  param3
)

Which I think is clearer, just because I need to respect the method length limit.

Sometimes calling the method in one line isn't possible if I respect a 80 characters line width.

Describe the solution you'd like

I'd like to be able to specify that method calls can be counted as a single line. Something like:

Metrics/MethodLength:
  CountAsOne: ['arguments']

[fatkodima]

Makes sense to me.
@bbatsov what do you think on this change?

[bbatsov]

Sounds reasonable.