Clang format and fix copyrights

include/grpc/impl/codegen/time.h

src/core/support/avl.c

src/core/support/stack_lockfree.c

src/core/support/time.c

src/node/ext/timeval.cc

src/python/grpcio/grpc/_cython/_cygrpc/grpc.pxi

src/python/grpcio/grpc/_cython/_cygrpc/records.pyx.pxi

src/python/grpcio/grpc/_cython/cygrpc.pyx

test/core/statistics/census_log_tests.c

test/core/support/sync_test.c

test/core/support/time_test.c

test/core/util/test_config.h

test/cpp/qps/client_async.cc

test/cpp/qps/driver.h

test/cpp/util/time_test.cc

test/distrib/python/distribtest.py

tools/run_tests/build_artifact_python.sh