Add script for canonicalization of includes

[metrapoliten]

No description provided.

[BUYT-1]

I'm not entirely sure it should be in the repository. Just drop it in the comments of one of the includes PR.

[chernishev]

I'm not entirely sure it should be in the repository. Just drop it in the comments of one of the includes PR.

There are several such scripts, e.g. script for IWYU. May be we should start storing them in a centralized way (e.g. in the repo), in case if we need them?

[BUYT-1]

I'm not entirely sure it should be in the repository. Just drop it in the comments of one of the includes PR.

There are several such scripts, e.g. script for IWYU. May be we should start storing them in a centralized way (e.g. in the repo), in case if we need them?

Can't this particular constraint be enforced with a git grep?
As for in general, maybe a separate repo in the organization can work for that?