Add cli args

[gabrieldemarmiesse]

Fix #3 (partially)

We needed it in tensorflow/addons You can see this PR where I use the branch in my fork: tensorflow/addons#1012

[gabrieldemarmiesse]

It's ready for review.

[DoozyX]

@gabrieldemarmiesse Sorry for the late response.

Thank you for the PR.

The run-clang-format script is from another repository (https://github.com/Sarcasm/run-clang-format), I tried adding it as a submodule but it didn't work. There was a similar pull request (Sarcasm/run-clang-format#16) there for this feature but it got closed recently because of inactivity, and I would like the script to stay the same as there for now. If you want you can make the pull request there or I could do it, the major difference is that the author suggested the name to be "extra-arg".

[Flamefire]

I opened #8 which just uses the --style option. This is consistent with the open PRs from the mentioned repo and seems to work for @gabrieldemarmiesse (you are only using the --style option aren't you?)