Add clang-format PRESUBMIT hook
Add clang-format PRESUBMIT hook

Test: added lines without correct formatting observed error
Test: uploaded without errors
Change-Id: I4bcf8d5928e2ee4c1240cdfa9ce8dfa84184be64

google/conscrypt,google/conscrypt,google/conscrypt,google/conscrypt,google/conscrypt,google/conscrypt