Add script to run clang format to be used in CI later.
Add script to run clang format to be used in CI later.

This script runs clang-format on all non-generated
code, that will automatically format the code according
to the best practices and conventions in the style guide
https://google.github.io/styleguide/cppguide.html

Adding this script does not do anything yet. Steps to
follow:
  1) run it once to format existing code as a baseline.
  2) Add this as a script that runs in the CI.

Signed-off-by: Henner Zeller <259ad50fabbfd39355f36ecd6c0afca541ea66ef@acm.org>

chipsalliance/Surelog,alainmarcel/Surelog,chipsalliance/Surelog,chipsalliance/Surelog,alainmarcel/Surelog,chipsalliance/Surelog,alainmarcel/Surelog,alainmarcel/Surelog