Enable clang-format-check workflow

Enforce clang-format consistency on all new changes.

.github/workflows/clang-format-check.yml

@@ -0,0 +1,12 @@
+name: clang-format
+on: [push, pull_request]
+jobs:
+  formatting-check:
+    name: Formatting Check
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Run clang-format style check.
+      uses: jidicula/clang-format-action@v4.5.0
+      with:
+        exclude-regex: '^deps'