clang-format all core files

src/core/client_config/subchannel.c

src/core/iomgr/exec_ctx.h

src/core/iomgr/iocp_windows.c

src/core/iomgr/iocp_windows.h

src/core/iomgr/pollset_set_windows.c

src/core/iomgr/pollset_windows.c

src/core/iomgr/sockaddr_utils.c

src/core/iomgr/tcp_client_windows.c

src/core/iomgr/tcp_server_windows.c

src/core/iomgr/tcp_windows.c

src/core/security/security_connector.c

src/core/support/stack_lockfree.c

src/core/surface/server.c

src/core/surface/version.c

test/core/util/port_windows.c