Wemake-python-styleguide: Add Exceptions for String Constant Overuse

[webartifex]

Rule request

I feel it would be good to be able to declare exceptions for WPS226

Thesis / Reasoning

In a file on a current project, I tend to use " ".join(iterable) a lot.
It feels unnatural to declare a CONSTANT for that.
Also, I don't think it is good in this case to disable WPS226 for the entire file as there could be other common string constants.

Alternative: Excluse " ", "", "\n" & friends from this by default.

[orsinium]

I'm for the last proposed solution 👍 No harm in using these strings in-place. They can be excluded onthe wps level by default.

[theoden-dd]

+1. Had a similar case with dict.get(field, '') used for several fields.

Looks like exclusions to the magic numbers (WPS432), which are reasonable, too.

[sum35h]

Hi, I would like to help.

[sobolevn]

Hi, @sumeshpradhan! Thanks a lot!

[lensvol]

Can I take this over?