Add clang-format check as a part of the presubmit checks

[kammce]

Currently, the files need to be checked manually during review to see if they abide by the clang-format rules. What can be done instead is, each file is checked against what clang-format would have changed about the file. If the file and the clang-format file differ (meaning clang-format would have wanted to change it), it means the collaborator has two choices:

1. Run clang-format on their file

OR

2. They add clang-format guards to their code to keep clang-format from formatting a specific section of code (this could be a very neatly laid out array or structure).

Failing to have properly formatted code will result in the pre-submit failing.