Function grin_p2p::msg::read_header

pub fn read_header(
    stream: &mut dyn Read, 
    version: ProtocolVersion
) -> Result<MsgHeaderWrapper, Error>

Read a header from the provided stream without blocking if the underlying stream is async. Typically headers will be polled for, so we do not want to block.

Note: We return a MsgHeaderWrapper here as we may encounter an unknown msg type.