add linter to remove trailing whitespace

[jmayclin]

Problem:

Removing whitespace is the default setting of clang-format. However, clang-format will only remove whitespace if something in the file changes.

Additionally, some IDE's will remove trailing whitespace by default. This results in a messier diff when those PR's are opened.

Solution:

We should add a linter run in our CI to ensure that no.c or .h files have any trailing whitespace

Requirements / Acceptance Criteria:

It must run in CI
It must be runnable locally