Neovim::Ext::MsgPack::RPC::Stream - Neovim::Ext::MsgPack::RPC::Stream class
Run the event loop to receive messages from Nvim. While the event loop is running,
\&message_cb will be called whenever a message is received.
Stop the event loop.
$msg for sending to Nvim.
Close the event loop.
Create a future.
$future to complete.