Improve streamed rpc calls

[windmemory]

Currently the definition of streamed rpc calls having two problems:

• MessageSendFile might transfer large data volume to server, so this function also needs to be converted to use stream
• Converting the original filebox string to data bytes in the stream calls requires one more property: name, which means we need to add a name property to stream data.

[huan]

Thank you very much for sharing your insights and for sending this great improvement PR!

[windmemory]

Let's close this issue since the PR is merged and changes are made in v0.18.1