Extend clang-format to C#, Node, Ruby

src/csharp/ext/grpc_csharp_ext.c

src/node/ext/byte_buffer.cc

src/node/ext/byte_buffer.h

src/node/ext/call.cc

src/node/ext/call.h

src/node/ext/call_credentials.cc

src/node/ext/call_credentials.h

src/node/ext/channel.cc

src/node/ext/channel.h

src/node/ext/channel_credentials.cc

src/node/ext/channel_credentials.h

src/node/ext/completion_queue.h

src/node/ext/node_grpc.cc

src/node/ext/server.cc

src/node/ext/server.h

src/node/ext/server_credentials.cc

src/node/ext/server_credentials.h

src/node/ext/server_uv.cc

src/node/ext/slice.cc

src/node/ext/slice.h